diff --git a/Mac/Python/macmain.c b/Mac/Python/macmain.c
index 8d2d8f7..a96af4b 100644
--- a/Mac/Python/macmain.c
+++ b/Mac/Python/macmain.c
@@ -539,6 +539,15 @@
 }
 
 /*
+** Reset the "unseen output" flag
+*/
+void
+PyMac_OutputSeen()
+{
+	gusisioux_state = GUSISIOUX_STATE_LASTREAD;
+}
+
+/*
 ** Terminate application
 */
 void