diff --git a/src/malloc/__simple_malloc.c b/src/malloc/__simple_malloc.c
index 61cd9fc4..c029342c 100644
--- a/src/malloc/__simple_malloc.c
+++ b/src/malloc/__simple_malloc.c
@@ -15,6 +15,7 @@ void *__simple_malloc(size_t n)
 	static int lock;
 	size_t align=1;
 
+	if (!n) return 0;
 	if (n > SIZE_MAX/2) goto toobig;
 
 	while (align<n && align<ALIGN)