diff --git a/owlps-positioner/timestamp.cc b/owlps-positioner/timestamp.cc
index ee546eb..40c8a7c 100644
--- a/owlps-positioner/timestamp.cc
+++ b/owlps-positioner/timestamp.cc
@@ -215,6 +215,20 @@ bool Timestamp::after(const struct timespec &source) const
 /* *** Operators *** */
 
 
+Timestamp& Timestamp::operator=(const struct timespec &source)
+{
+  set(source) ;
+  return *this ;
+}
+
+
+Timestamp& Timestamp::operator=(const uint64_t source)
+{
+  set(source) ;
+  return *this ;
+}
+
+
 Timestamp& Timestamp::operator=(const Timestamp &source)
 {
   if (this == &source)
diff --git a/owlps-positioner/timestamp.hh b/owlps-positioner/timestamp.hh
index 7b1b74c..dad2f8e 100644
--- a/owlps-positioner/timestamp.hh
+++ b/owlps-positioner/timestamp.hh
@@ -139,20 +139,6 @@ inline void Timestamp::clear(void)
 /* *** Operators *** */
 
 
-inline Timestamp& Timestamp::operator=(const struct timespec &source)
-{
-  set(source) ;
-  return *this ;
-}
-
-
-inline Timestamp& Timestamp::operator=(const uint64_t source)
-{
-  set(source) ;
-  return *this ;
-}
-
-
 inline bool Timestamp::operator==(const struct timespec &source) const
 {
   return equals(source) ;