2 files changed, 9 insertions, 9 deletions
diff --git a/backends/morphos/morphos.cpp b/backends/morphos/morphos.cpp
index ebfd651c54..b316f1b97c 100644
--- a/backends/morphos/morphos.cpp
+++ b/backends/morphos/morphos.cpp
@@ -316,27 +316,27 @@ void OSystem_MorphOS::create_thread(ThreadProc *proc, void *param)
 													 NP_PPC_Arg1, (ULONG) param, TAG_DONE);
 }
 
-void *OSystem_MorphOS::create_mutex()
+MutexRef OSystem_MorphOS::create_mutex()
 {
 	SignalSemaphore *sem = (SignalSemaphore *) AllocVec(sizeof (SignalSemaphore), MEMF_PUBLIC);
 
 	if (sem)
 		InitSemaphore(sem);
 
-	return sem;
+	return (MutexRef)sem;
 }
 
-void OSystem_MorphOS::lock_mutex(void *mutex)
+void OSystem_MorphOS::lock_mutex(MutexRef mutex)
 {
 	ObtainSemaphore((SignalSemaphore *) mutex);
 }
 
-void OSystem_MorphOS::unlock_mutex(void *mutex)
+void OSystem_MorphOS::unlock_mutex(MutexRef mutex)
 {
 	ReleaseSemaphore((SignalSemaphore *)mutex);
 }
 
-void OSystem_MorphOS::delete_mutex(void *mutex)
+void OSystem_MorphOS::delete_mutex(MutexRef mutex)
 {
 	FreeVec(mutex);
 }
diff --git a/backends/morphos/morphos.h b/backends/morphos/morphos.h
index 124e7b17f3..5076c2d479 100644
--- a/backends/morphos/morphos.h
+++ b/backends/morphos/morphos.h
@@ -85,10 +85,10 @@ class OSystem_MorphOS : public OSystem
 		virtual void set_timer(int timer, int (*callback)(int));
 
 		// Mutex handling
-		virtual void *create_mutex();
-		virtual void lock_mutex(void *mutex);
-		virtual void unlock_mutex(void *mutex);
-		virtual void delete_mutex(void *mutex);
+		virtual MutexRef create_mutex();
+		virtual void lock_mutex(MutexRef mutex);
+		virtual void unlock_mutex(MutexRef mutex);
+		virtual void delete_mutex(MutexRef mutex);
 
 		// Create a thread
 		virtual void create_thread(ThreadProc *proc, void *param);