diff --git a/owlps-positioner/autocalibration.hh b/owlps-positioner/autocalibration.hh
index 2ecfa25..099a2bf 100644
--- a/owlps-positioner/autocalibration.hh
+++ b/owlps-positioner/autocalibration.hh
@@ -56,7 +56,7 @@ protected:
   virtual bool compute_single_packet_ss(pkt_id_t pkt_id) = 0 ;
 
 public:
-  Autocalibration(const Point3D &_point): point(_point) {}
+  explicit Autocalibration(const Point3D &_point): point(_point) {}
 
   /// Generates a single reference point
   void generate_reference_point(void) ;
diff --git a/owlps-positioner/autocalibrationmesh.hh b/owlps-positioner/autocalibrationmesh.hh
index 1583576..5b6037d 100644
--- a/owlps-positioner/autocalibrationmesh.hh
+++ b/owlps-positioner/autocalibrationmesh.hh
@@ -78,7 +78,7 @@ protected:
                              const float point_dst) ;
 
 public:
-  AutocalibrationMesh(const Point3D &_point): Autocalibration(_point) {}
+  explicit AutocalibrationMesh(const Point3D &_point): Autocalibration(_point) {}
 } ;
 
 #endif // _OWLPS_POSITIONING_AUTOCALIBRATIONMESH_HH_
diff --git a/owlps-positioner/building.hh b/owlps-positioner/building.hh
index a2bc41c..fd604c3 100644
--- a/owlps-positioner/building.hh
+++ b/owlps-positioner/building.hh
@@ -34,7 +34,7 @@ protected:
   std::unordered_set<Waypoint*> waypoints ;
 
 public:
-  Building(const std::string &_name = "Unnamed building"):
+  explicit Building(const std::string &_name = "Unnamed building"):
     name(_name) {}
 
   Building(const Building &source):
diff --git a/owlps-positioner/calibrationrequest.hh b/owlps-positioner/calibrationrequest.hh
index e381d50..2e078cc 100644
--- a/owlps-positioner/calibrationrequest.hh
+++ b/owlps-positioner/calibrationrequest.hh
@@ -30,7 +30,8 @@ protected:
   Direction direction ;
 
 public:
-  CalibrationRequest(const uint_fast8_t _type = OWL_REQUEST_AUTOCALIBRATION) ;
+  explicit CalibrationRequest(const uint_fast8_t _type
+                              = OWL_REQUEST_AUTOCALIBRATION);
 
   CalibrationRequest(const CalibrationRequest &source):
     Request(source), reference_point(source.reference_point),
diff --git a/owlps-positioner/capturepoint.hh b/owlps-positioner/capturepoint.hh
index b4c2be4..9f3f01a 100644
--- a/owlps-positioner/capturepoint.hh
+++ b/owlps-positioner/capturepoint.hh
@@ -57,7 +57,7 @@ public:
     frequency(PosUtil::wifi_channel_to_hz(channel)),
     friis_index(0) {}
 
-  CapturePoint(const WifiDevice &source):
+  explicit CapturePoint(const WifiDevice &source):
     WifiDevice(source), coordinates(Point3D()), frequency(0),
     friis_index(0) {}
 
diff --git a/owlps-positioner/capturepointsreadercsv.hh b/owlps-positioner/capturepointsreadercsv.hh
index 5b05454..e98f06d 100644
--- a/owlps-positioner/capturepointsreadercsv.hh
+++ b/owlps-positioner/capturepointsreadercsv.hh
@@ -35,7 +35,7 @@ protected:
   void process_device_line(void) ;
 
 public:
-  CapturePointsReaderCSV(const std::string &file_name) ;
+  explicit CapturePointsReaderCSV(const std::string &file_name);
 
   ~CapturePointsReaderCSV(void) {}
 } ;
diff --git a/owlps-positioner/csvstringreader.hh b/owlps-positioner/csvstringreader.hh
index 72de2c7..b344ebf 100644
--- a/owlps-positioner/csvstringreader.hh
+++ b/owlps-positioner/csvstringreader.hh
@@ -38,7 +38,7 @@ protected:
   void print_error_cast(void) const ;
 
 public:
-  CSVStringReader(const char _separator = ';'):
+  explicit CSVStringReader(const char _separator = ';'):
     separator(_separator), current_token(nullptr), current_field_nb(0) {}
 
   CSVStringReader(const std::string &_str, const char _separator = ';') ;
diff --git a/owlps-positioner/inputcsv.hh b/owlps-positioner/inputcsv.hh
index 6c2920e..d250e36 100644
--- a/owlps-positioner/inputcsv.hh
+++ b/owlps-positioner/inputcsv.hh
@@ -44,7 +44,7 @@ protected:
   //@}
 
 public:
-  InputCSV(const std::string &filename):
+  explicit InputCSV(const std::string &filename):
     file(filename) {}
 
   ~InputCSV(void) {}
diff --git a/owlps-positioner/inputlogcsv.hh b/owlps-positioner/inputlogcsv.hh
index 0a2076f..251c772 100644
--- a/owlps-positioner/inputlogcsv.hh
+++ b/owlps-positioner/inputlogcsv.hh
@@ -28,7 +28,7 @@ protected:
   TextFileWriter file ;
 
 public:
-  InputLogCSV(const std::string &filename):
+  explicit InputLogCSV(const std::string &filename):
     file(filename) {}
 
   /** @name Operations */
diff --git a/owlps-positioner/inputudpsocket.hh b/owlps-positioner/inputudpsocket.hh
index e3b9a6b..7c66bce 100644
--- a/owlps-positioner/inputudpsocket.hh
+++ b/owlps-positioner/inputudpsocket.hh
@@ -40,7 +40,7 @@ protected:
   //@}
 
 public:
-  InputUDPSocket(const uint_fast16_t _port) ;
+  explicit InputUDPSocket(const uint_fast16_t _port);
 
   ~InputUDPSocket(void) ;
 
diff --git a/owlps-positioner/measurement.hh b/owlps-positioner/measurement.hh
index 8ff1960..6c3ce45 100644
--- a/owlps-positioner/measurement.hh
+++ b/owlps-positioner/measurement.hh
@@ -65,7 +65,7 @@ protected:
 
 
 public:
-  Measurement(const CapturePoint *const _cp = nullptr):
+  explicit Measurement(const CapturePoint *const _cp = nullptr):
     cp(_cp), average_dbm(0),
     average_mw(0), variance_mw(0), variance_dbm(0),
     variance_mw_m2(0), variance_dbm_m2(0), variance_size(0) {}
diff --git a/owlps-positioner/mobile.hh b/owlps-positioner/mobile.hh
index 3016bd1..ed23966 100644
--- a/owlps-positioner/mobile.hh
+++ b/owlps-positioner/mobile.hh
@@ -50,7 +50,7 @@ public:
     WifiDevice(_ip_addr, _mac_addr, _antenna_gain, _trx_power),
     last_request(nullptr) {}
 
-  Mobile(const WifiDevice &wd):
+  explicit Mobile(const WifiDevice &wd):
     WifiDevice(wd), last_request(nullptr) {}
 
   Mobile(const Mobile &m) ;
diff --git a/owlps-positioner/mobilesreadercsv.hh b/owlps-positioner/mobilesreadercsv.hh
index 77f494e..e65013d 100644
--- a/owlps-positioner/mobilesreadercsv.hh
+++ b/owlps-positioner/mobilesreadercsv.hh
@@ -35,7 +35,7 @@ protected:
   void process_device_line(void) ;
 
 public:
-  MobilesReaderCSV(const std::string &file_name) ;
+  explicit MobilesReaderCSV(const std::string &file_name);
 
   ~MobilesReaderCSV(void) {}
 } ;
diff --git a/owlps-positioner/outputcsv.hh b/owlps-positioner/outputcsv.hh
index 9440d39..6156cde 100644
--- a/owlps-positioner/outputcsv.hh
+++ b/owlps-positioner/outputcsv.hh
@@ -28,7 +28,7 @@ protected:
   TextFileWriter file ;
 
 public:
-  OutputCSV(const std::string &filename):
+  explicit OutputCSV(const std::string &filename):
     file(filename) {}
 
   void write(const Result &result) ;
diff --git a/owlps-positioner/outputterminal.hh b/owlps-positioner/outputterminal.hh
index 0e8917d..1097104 100644
--- a/owlps-positioner/outputterminal.hh
+++ b/owlps-positioner/outputterminal.hh
@@ -26,7 +26,7 @@ protected:
   std::ostream &output_stream ;
 
 public:
-  OutputTerminal(std::ostream &_output_stream = std::cout):
+  explicit OutputTerminal(std::ostream &_output_stream = std::cout):
     output_stream(_output_stream) {}
 
   void write(const Result &result) ;
diff --git a/owlps-positioner/point3d.hh b/owlps-positioner/point3d.hh
index 8f041a4..e78f38c 100644
--- a/owlps-positioner/point3d.hh
+++ b/owlps-positioner/point3d.hh
@@ -39,10 +39,10 @@ public:
   Point3D(const Point3D &source):
     x(source.x), y(source.y), z(source.z) {}
 
-  Point3D(const float source[3]):
+  explicit Point3D(const float source[3]):
     x(source[0]), y(source[1]), z(source[2]) {}
 
-  Point3D(const std::string &source) ;
+  explicit Point3D(const std::string &source);
 
   virtual ~Point3D(void) {}
 
diff --git a/owlps-positioner/posexcept.hh b/owlps-positioner/posexcept.hh
index afa1192..41a2c04 100644
--- a/owlps-positioner/posexcept.hh
+++ b/owlps-positioner/posexcept.hh
@@ -27,7 +27,7 @@ protected:
   std::string explanation ;
 
 public:
-  posexcept(const std::string &_explanation = "") throw():
+  explicit posexcept(const std::string &_explanation = "") throw():
     explanation(_explanation) {}
 
   ~posexcept(void) throw() {}
@@ -46,28 +46,28 @@ public:
 class cannot_merge: public posexcept
 {
 public:
-  cannot_merge(const std::string &_explanation) throw() ;
+  explicit cannot_merge(const std::string &_explanation) throw();
 } ;
 
 
 class element_already_exists: public posexcept
 {
 public:
-  element_already_exists(const std::string &_explanation) throw() ;
+  explicit element_already_exists(const std::string &_explanation) throw();
 } ;
 
 
 class element_not_found: public posexcept
 {
 public:
-  element_not_found(const std::string &_explanation) throw() ;
+  explicit element_not_found(const std::string &_explanation) throw();
 } ;
 
 
 class autocalibration_error: public posexcept
 {
 public:
-  autocalibration_error(const std::string &_explanation) throw() ;
+  explicit autocalibration_error(const std::string &_explanation) throw();
 } ;
 
 
@@ -78,14 +78,14 @@ public:
 class missing_configuration: public posexcept
 {
 public:
-  missing_configuration(const std::string &_explanation) throw() ;
+  explicit missing_configuration(const std::string &_explanation) throw();
 } ;
 
 
 class bad_configuration: public posexcept
 {
 public:
-  bad_configuration(const std::string &_explanation) throw() ;
+  explicit bad_configuration(const std::string &_explanation) throw();
 } ;
 
 
@@ -96,21 +96,21 @@ public:
 class malformed_input_data: public posexcept
 {
 public:
-  malformed_input_data(const std::string &_explanation) throw() ;
+  explicit malformed_input_data(const std::string &_explanation) throw();
 } ;
 
 
 class bad_direction: public posexcept
 {
 public:
-  bad_direction(const char direction) throw() ;
+  explicit bad_direction(const char direction) throw();
 } ;
 
 
 class bad_channel: public posexcept
 {
 public:
-  bad_channel(const unsigned long channel) throw() ;
+  explicit bad_channel(const unsigned long channel) throw();
 } ;
 
 
@@ -128,14 +128,14 @@ public:
 class error_opening_input_file: public posexcept
 {
 public:
-  error_opening_input_file(const std::string &file_name) throw() ;
+  explicit error_opening_input_file(const std::string &file_name) throw();
 } ;
 
 
 class error_opening_output_file: public posexcept
 {
 public:
-  error_opening_output_file(const std::string &file_name) throw() ;
+  explicit error_opening_output_file(const std::string &file_name) throw();
 } ;
 
 
diff --git a/owlps-positioner/positioningalgorithm.hh b/owlps-positioner/positioningalgorithm.hh
index 8a556e6..8b38823 100644
--- a/owlps-positioner/positioningalgorithm.hh
+++ b/owlps-positioner/positioningalgorithm.hh
@@ -26,7 +26,7 @@ protected:
   const std::string name ;
 
 public:
-  PositioningAlgorithm(const std::string &_name = "UnknownAlgorithm"):
+  explicit PositioningAlgorithm(const std::string &_name = "UnknownAlgorithm"):
     name(_name) {}
   virtual ~PositioningAlgorithm(void) {}
 
diff --git a/owlps-positioner/request.hh b/owlps-positioner/request.hh
index 08e7aad..855a57f 100644
--- a/owlps-positioner/request.hh
+++ b/owlps-positioner/request.hh
@@ -71,8 +71,8 @@ public:
           const std::unordered_map<std::string, Measurement>
           &_measurements = measurements_list()) ;
 
-  Request(const std::unordered_map<std::string, Measurement>
-          &_measurements) ;
+  explicit Request(const std::unordered_map<std::string, Measurement>
+                   &_measurements);
 
   Request(const Timestamp &_time_sent,
           const std::unordered_map<std::string, Measurement>
diff --git a/owlps-positioner/tests/referencepoint_test.hh b/owlps-positioner/tests/referencepoint_test.hh
index 9040777..27b57d4 100644
--- a/owlps-positioner/tests/referencepoint_test.hh
+++ b/owlps-positioner/tests/referencepoint_test.hh
@@ -40,7 +40,7 @@ public:
 
     // 3-float array constructor
     float coord[3] = {1, 2, 3} ;
-    ReferencePoint rp3(coord) ;
+    ReferencePoint rp3((Point3D(coord))) ;
     TS_ASSERT_EQUALS(rp1, rp3) ;
   }
 
diff --git a/owlps-positioner/tests/waypoint_test.hh b/owlps-positioner/tests/waypoint_test.hh
index c394294..9183620 100644
--- a/owlps-positioner/tests/waypoint_test.hh
+++ b/owlps-positioner/tests/waypoint_test.hh
@@ -42,7 +42,7 @@ public:
 
     // 3-float array constructor
     float coord[3] = {5, 3, 8} ;
-    Waypoint wp3(coord) ;
+    Waypoint wp3((Point3D(coord))) ;
     TS_ASSERT_EQUALS(wp3, wp4) ;
   }
 
diff --git a/owlps-positioner/textfilereader.hh b/owlps-positioner/textfilereader.hh
index 88d6227..3c65948 100644
--- a/owlps-positioner/textfilereader.hh
+++ b/owlps-positioner/textfilereader.hh
@@ -38,7 +38,7 @@ protected:
   bool eof_close(void) ;
 
 public:
-  TextFileReader(const std::string &_file_name) ;
+  explicit TextFileReader(const std::string &_file_name);
   virtual ~TextFileReader(void) ;
 
   /** @name Operations */
diff --git a/owlps-positioner/textfilewriter.hh b/owlps-positioner/textfilewriter.hh
index 88c0d9e..0b35857 100644
--- a/owlps-positioner/textfilewriter.hh
+++ b/owlps-positioner/textfilewriter.hh
@@ -33,7 +33,7 @@ private:
   std::streambuf *file_buf ;
 
 public:
-  TextFileWriter(const std::string &_file_name) ;
+  explicit TextFileWriter(const std::string &_file_name);
   virtual ~TextFileWriter(void) ;
 
   bool write_text(const std::string &text) ;
diff --git a/owlps-positioner/timestamp.hh b/owlps-positioner/timestamp.hh
index 6d43b3f..2199683 100644
--- a/owlps-positioner/timestamp.hh
+++ b/owlps-positioner/timestamp.hh
@@ -62,11 +62,11 @@ protected:
 
 public:
   Timestamp(void) ;
-  Timestamp(const struct timespec &source) ;
+  explicit Timestamp(const struct timespec &source);
   Timestamp(const owl_timestamp &source) ;
   Timestamp(const uint_fast32_t source_s, const uint_fast32_t source_ns) ;
   /// Constructs a Timsestamp from a value in milliseconds (deprecated)
-  Timestamp(const uint64_t source) ;
+  explicit Timestamp(const uint64_t source);
   Timestamp(const Timestamp &source) ;
 
   ~Timestamp(void) {}
diff --git a/owlps-positioner/waypoint.hh b/owlps-positioner/waypoint.hh
index f16aa6d..0efeefa 100644
--- a/owlps-positioner/waypoint.hh
+++ b/owlps-positioner/waypoint.hh
@@ -42,7 +42,7 @@ public:
 
   Waypoint(Building *const _b, const Point3D &p) ;
 
-  Waypoint(const Point3D &p): Point3D(p) {}
+  explicit Waypoint(const Point3D &p): Point3D(p) {}
 
   Waypoint(const Waypoint &wp): Point3D(wp), buildings(wp.buildings) {}