1 files changed, 2 insertions, 2 deletions
diff --git a/src/common/Mutex.h b/src/common/Mutex.h
index 06e435d49df..e26a090703d 100644
--- a/src/common/Mutex.h
+++ b/src/common/Mutex.h
@@ -46,8 +46,8 @@ private:
   PerfCounters *logger;
 
   // don't allow copying.
-  void operator=(Mutex &M) {}
-  Mutex( const Mutex &M ) {}
+  void operator=(Mutex &M);
+  Mutex(const Mutex &M);
 
   void _register() {
     id = lockdep_register(name);