diff --git a/include/gos/chibios.h b/include/gos/chibios.h
index 5193587a..e9d3e8d2 100644
--- a/include/gos/chibios.h
+++ b/include/gos/chibios.h
@@ -73,7 +73,7 @@ extern "C" {
 #define gfxSystemLock()				chSysLock()
 #define gfxSystemUnlock()			chSysUnlock()
 #define gfxMutexInit(pmutex)		chMtxInit(pmutex)
-#define gfxMutexDestroy(pmutex)		{}
+#define gfxMutexDestroy(pmutex)		(void)pmutex
 #define gfxMutexEnter(pmutex)		chMtxLock(pmutex)
 #define gfxMutexExit(pmutex)		chMtxUnlock()
 void *gfxRealloc(void *ptr, size_t oldsz, size_t newsz);
@@ -89,7 +89,7 @@ void gfxSemSignalI(gfxSem *psem);
 gfxThreadHandle gfxThreadCreate(void *stackarea, size_t stacksz, threadpriority_t prio, DECLARE_THREAD_FUNCTION((*fn),p), void *param);
 #define gfxThreadWait(thread)		chThdWait(thread)
 #define gfxThreadMe()				chThdSelf()
-#define gfxThreadClose(thread)		{}
+#define gfxThreadClose(thread)		(void)thread
 
 #ifdef __cplusplus
 }
diff --git a/include/gos/linux.h b/include/gos/linux.h
index 508b2b68..f8b049e9 100644
--- a/include/gos/linux.h
+++ b/include/gos/linux.h
@@ -41,7 +41,7 @@ typedef pthread_mutex_t		gfxMutex;
 #define gfxMillisecondsToTicks(ms)		(ms)
 #define gfxYield()						pthread_yield()
 #define gfxThreadMe()					pthread_self()
-#define gfxThreadClose(th)				{}
+#define gfxThreadClose(th)				(void)th
 #define gfxMutexInit(pmtx)				pthread_mutex_init(pmtx, 0)
 #define gfxMutexDestroy(pmtx)			pthread_mutex_destroy(pmtx)
 #define gfxMutexEnter(pmtx)				pthread_mutex_lock(pmtx)
diff --git a/include/gos/osx.h b/include/gos/osx.h
index 3f36aaff..56e0551e 100644
--- a/include/gos/osx.h
+++ b/include/gos/osx.h
@@ -40,7 +40,7 @@ typedef pthread_mutex_t		gfxMutex;
 #define gfxMillisecondsToTicks(ms)		(ms)
 #define gfxYield()						sched_yield()
 #define gfxThreadMe()					pthread_self()
-#define gfxThreadClose(th)				{}
+#define gfxThreadClose(th)				(void)th
 #define gfxMutexInit(pmtx)				pthread_mutex_init(pmtx, 0)
 #define gfxMutexDestroy(pmtx)			pthread_mutex_destroy(pmtx)
 #define gfxMutexEnter(pmtx)				pthread_mutex_lock(pmtx)