diff --git a/Source/Core/Common/Src/Thread.cpp b/Source/Core/Common/Src/Thread.cpp
index df7c8d50d9..db02b4598e 100644
--- a/Source/Core/Common/Src/Thread.cpp
+++ b/Source/Core/Common/Src/Thread.cpp
@@ -345,17 +345,16 @@ void Event::Wait()
 	pthread_mutex_unlock(&mutex_);
 }
 
-int InterlockedExchangeAdd( int* Addend, int Increment )
+int InterlockedExchangeAdd(int *Addend, int Increment)
 {
-
 #if defined(__GNUC__) && defined (__GNUC_MINOR__) && ((4 < __GNUC__) || (4 == __GNUC__ && 1 <= __GNUC_MINOR__))
   return  __sync_add_and_fetch(Addend, Increment);
 #else
+#error Sorry - GCC versions that don't support __sync_add_and_fetch are not supported.
   // TODO support old gcc
 #endif
 }
 
 #endif
 
-
 } // end of namespace Common
diff --git a/Source/Core/Common/Src/Thread.h b/Source/Core/Common/Src/Thread.h
index 3cc608f335..e71306baf1 100644
--- a/Source/Core/Common/Src/Thread.h
+++ b/Source/Core/Common/Src/Thread.h
@@ -112,9 +112,12 @@ class Event
 
 void SleepCurrentThread(int ms);
 
-void SetCurrentThreadName(const char* name);
+void SetCurrentThreadName(const char *name);
+
+#ifndef _WIN32
+int InterlockedExchangeAdd(int *Addend, int Increment);
+#endif
 
-int InterlockedExchangeAdd( int* Addend, int Increment );
 } // end of namespace Common