diff --git a/appl/ftp/ftp/ftp_locl.h b/appl/ftp/ftp/ftp_locl.h
index c319a7386..7831d71cf 100644
--- a/appl/ftp/ftp/ftp_locl.h
+++ b/appl/ftp/ftp/ftp_locl.h
@@ -5,6 +5,8 @@
 #include <config.h>
 #endif
 
+#include <protos.h>
+
 #include <sys/bitypes.h>
 #include <sys/cdefs.h>