diff --git a/owlps-positioning/src/posutil.cc b/owlps-positioning/src/posutil.cc
index 78db584..b88e8da 100644
--- a/owlps-positioning/src/posutil.cc
+++ b/owlps-positioning/src/posutil.cc
@@ -163,3 +163,21 @@ unsigned long PosUtil::wifi_channel_to_hz(const unsigned long &channel)
   // Error: wrong channel value
   throw bad_channel(channel) ;
 }
+
+
+
+/* *** Strings *** */
+
+
+string PosUtil::int_to_mac(const uint32_t source)
+{
+  uint8_t bytes[6] ;
+  memset(bytes, 0, 6) ;
+  for (int i = 0 ; i < 4 ; ++i)
+    bytes[i+2] = reinterpret_cast<const uint8_t*>(&source)[i] ;
+  char mac_cstr[OWL_ETHER_ADDR_STRLEN] ;
+  owl_mac_bytes_to_string_r(bytes, mac_cstr) ;
+  string mac(mac_cstr) ;
+  to_upper(mac) ;
+  return mac ;
+}
diff --git a/owlps-positioning/src/posutil.hh b/owlps-positioning/src/posutil.hh
index ef1c64b..0a5cb7f 100644
--- a/owlps-positioning/src/posutil.hh
+++ b/owlps-positioning/src/posutil.hh
@@ -41,6 +41,7 @@ public:
   //@{
   static void to_upper(std::string &str) ;
   static void assert_uppercase(const std::string &str) ;
+  static std::string int_to_mac(const uint32_t source) ;
   //@}
 } ;