diff --git a/lib/stdlib/malloc.c b/lib/stdlib/malloc.c
index f4be4de1..6f4b4aec 100644
--- a/lib/stdlib/malloc.c
+++ b/lib/stdlib/malloc.c
@@ -40,7 +40,7 @@ malloc (size_t size)
   if (brk (__brk + size) == -1)
     return 0;
   char *p = __brk;
-  __brk += size;
+  __brk = __brk + size;
   return p;
 }
 #endif /* !__GNU__ */