diff --git a/lib/ftp.c b/lib/ftp.c
index 28ecdcdc1..a23acd43e 100644
--- a/lib/ftp.c
+++ b/lib/ftp.c
@@ -75,6 +75,7 @@
 #include "transfer.h"
 #include "escape.h"
 #include "http.h" /* for HTTP proxy tunnel stuff */
+#include "socks.h"
 #include "ftp.h"
 
 #ifdef HAVE_KRB4