diff --git a/lib/stdlib/malloc.c b/lib/stdlib/malloc.c
index 54f89af4..cdaa75dd 100644
--- a/lib/stdlib/malloc.c
+++ b/lib/stdlib/malloc.c
@@ -46,7 +46,7 @@ malloc (size_t size)
   if (brk (__brk + size) == -1)
     return 0;
   char *p = __brk;
-  __brk += size;
+  __brk = __brk + size;
   return p;
 }
 #endif /* !__GNU__ */