diff --git a/winpr/libwinpr/synch/semaphore.c b/winpr/libwinpr/synch/semaphore.c
index 4c54fa12e..9e33d8a8a 100644
--- a/winpr/libwinpr/synch/semaphore.c
+++ b/winpr/libwinpr/synch/semaphore.c
@@ -39,6 +39,8 @@ HANDLE CreateSemaphoreW(LPSECURITY_ATTRIBUTES lpSemaphoreAttributes, LONG lIniti
 	WINPR_SEMAPHORE* semaphore;
 
 	semaphore = (WINPR_SEMAPHORE*) malloc(sizeof(WINPR_SEMAPHORE));
+	if (!semaphore)
+		return NULL;
 
 	semaphore->pipe_fd[0] = -1;
 	semaphore->pipe_fd[0] = -1;