Index: libc/malloc/malloc.c
===================================================================
--- libc/malloc/malloc.c	(revision 936351c1f07abd9557396c96a0c7ff72a82989ec)
+++ libc/malloc/malloc.c	(revision e708063fcb109c2a31c5e928ec97215959de8633)
@@ -537,5 +537,5 @@
 #ifdef DEBUG
 #if ABORT_ON_ASSERT_FAILURE
-#define assert(x) if(!(x)) ABORT
+#define assert(x) {if(!(x)) {printf(#x);ABORT;}}
 #else /* ABORT_ON_ASSERT_FAILURE */
 #include <assert.h>