diff --git a/util/opt/alloc.h b/util/opt/alloc.h
index 004ce5016..2c1de3e19 100644
--- a/util/opt/alloc.h
+++ b/util/opt/alloc.h
@@ -16,7 +16,7 @@ extern		oldline();
 extern		oldloc();
 extern		oldreg();
 
-#undef USEMALLOC	/* if defined malloc() and free() are used */
+#define USEMALLOC	/* if defined malloc() and free() are used */
 
 #undef COREDEBUG	/* keep records and print statistics */