diff --git a/lib/connect.c b/lib/connect.c
index 9a78f16105..681fc0039b 100644
--- a/lib/connect.c
+++ b/lib/connect.c
@@ -77,7 +77,7 @@
 #include "if2ip.h"
 
 /* The last #include file should be: */
-#ifdef MALLOCDEBUG
+#ifdef CURLDEBUG
 #include "memdebug.h"
 #endif