diff --git a/src/keyboard.c b/src/keyboard.c
index 133333cd959..f78c57715db 100644
--- a/src/keyboard.c
+++ b/src/keyboard.c
@@ -1363,6 +1363,7 @@ cancel_hourglass_unwind (arg)
      Lisp_Object arg;
 {
   cancel_hourglass ();
+  return Qnil;
 }
 #endif