diff --git a/lib/base64.c b/lib/base64.c
index 3b36fd0b971ac12b6cf43d779b2b774b7e2f7537..4f48cc0b8405695b6a4c0e2323c4b4aafa3dc7f2 100644
--- a/lib/base64.c
+++ b/lib/base64.c
@@ -42,7 +42,7 @@
 
 #include "base64.h"
 
-#ifdef MALLOCDEBUG
+#ifdef CURLDEBUG
 #include "memdebug.h"
 #endif