diff --git a/src/OpenMesh/Tools/Utils/Timer.cc b/src/OpenMesh/Tools/Utils/Timer.cc
index d1c215c6d3057d619ba16973e2c9a4f0715370ba..86876667fa583043117709854e96dfe56614ce5d 100644
--- a/src/OpenMesh/Tools/Utils/Timer.cc
+++ b/src/OpenMesh/Tools/Utils/Timer.cc
@@ -63,19 +63,7 @@ namespace Utils {
 using namespace std;
 
 // -------------------------------------------------------------- TimerImpl ----
-// just a base class for the implementation
-class TimerImpl
-{
-protected:
-public:
-  TimerImpl()  { ; }
-  virtual ~TimerImpl() { ; }
-
-  virtual void   reset(void) = 0;
-  virtual void   start(void) = 0;
-  virtual void   stop(void)  = 0;
-  virtual void   cont(void)  = 0;
-  virtual double seconds(void) const = 0;
+
 };
 
 // compiler and os dependent implementation
diff --git a/src/OpenMesh/Tools/Utils/Timer.hh b/src/OpenMesh/Tools/Utils/Timer.hh
index 8d29d8f611e475b505470c94bc7e734d7b9f389d..731cf1cf84147459516548c8eb2ed3e83e6ce791 100644
--- a/src/OpenMesh/Tools/Utils/Timer.hh
+++ b/src/OpenMesh/Tools/Utils/Timer.hh
@@ -70,7 +70,20 @@ namespace Utils {
 // -------------------------------------------------------------- forwards ----
 
 
-class TimerImpl;
+// just a base class for the implementation
+class TimerImpl
+{
+protected:
+public:
+  TimerImpl()  { ; }
+  virtual ~TimerImpl() { ; }
+
+  virtual void   reset(void) = 0;
+  virtual void   start(void) = 0;
+  virtual void   stop(void)  = 0;
+  virtual void   cont(void)  = 0;
+  virtual double seconds(void) const = 0;
+};
 
 
 // ----------------------------------------------------------------- class ----