diff --git a/lib/file.c b/lib/file.c
index 307ccd89c58c6c7c414b5f9cea1aa04d59cf1ee0..20b6d1592c3ab3855db9d7ba1b520e0fd7a67430 100644
--- a/lib/file.c
+++ b/lib/file.c
@@ -88,7 +88,7 @@
 #include <curl/mprintf.h>
 
 /* The last #include file should be: */
-#ifdef MALLOCDEBUG
+#ifdef CURLDEBUG
 #include "memdebug.h"
 #endif