diff --git a/lib/ftp.c b/lib/ftp.c
index 0d16a201f6..864dca6c1d 100644
--- a/lib/ftp.c
+++ b/lib/ftp.c
@@ -77,6 +77,9 @@
 #include "krb4.h"
 #endif
 
+#define _MPRINTF_REPLACE /* use our functions only */
+#include <curl/mprintf.h>
+
 /* The last #include file should be: */
 #ifdef MALLOCDEBUG
 #include "memdebug.h"