diff --git a/os/kernel/src/chheap.c b/os/kernel/src/chheap.c
index ede326b59..820f15362 100644
--- a/os/kernel/src/chheap.c
+++ b/os/kernel/src/chheap.c
@@ -41,6 +41,8 @@
 
 #if CH_USE_HEAP
 
+#if !CH_USE_MALLOC_HEAP
+
 /*
  * Defaults on the best synchronization mechanism available.
  */
@@ -52,8 +54,6 @@
 #define H_UNLOCK(h)     chSemSignal(&(h)->h_sem)
 #endif
 
-#if !CH_USE_MALLOC_HEAP
-
 /**
  * @brief   Default heap descriptor.
  */
@@ -253,7 +253,7 @@ size_t chHeapStatus(MemoryHeap *heapp, size_t *sizep) {
 
 #if CH_USE_MUTEXES
 #define H_LOCK()        chMtxLock(&hmtx)
-#define H_UNLOCK()      chMtxUnock()
+#define H_UNLOCK()      chMtxUnlock()
 static Mutex            hmtx;
 #elif CH_USE_SEMAPHORES
 #define H_LOCK()        chSemWait(&hsem)