diff --git a/src/proto/term.pro b/src/proto/term.pro
index f5bdfc4..91bb85c 100644
--- a/src/proto/term.pro
+++ b/src/proto/term.pro
@@ -33,6 +33,7 @@
 void settmode __ARGS((int tmode));
 void starttermcap __ARGS((void));
 void stoptermcap __ARGS((void));
+void may_req_termresponse __ARGS((void));
 int swapping_screen __ARGS((void));
 void setmouse __ARGS((void));
 int mouse_has __ARGS((int c));