diff --git a/src/w32term.h b/src/w32term.h
index f458a4e3268..4c7c7a19a7f 100644
--- a/src/w32term.h
+++ b/src/w32term.h
@@ -646,6 +646,8 @@ extern CRITICAL_SECTION critsect;
 extern void init_crit ();
 extern void delete_crit ();
 
+extern void signal_quit ();
+
 #define enter_crit() EnterCriticalSection (&critsect)
 #define leave_crit() LeaveCriticalSection (&critsect)