diff --git a/Lib/idlelib/PyShell.py b/Lib/idlelib/PyShell.py
index 90c837c1bf2..bfd659c3362 100644
--- a/Lib/idlelib/PyShell.py
+++ b/Lib/idlelib/PyShell.py
@@ -961,6 +961,7 @@ class PyShell(OutputWindow):
     """
 
     def begin(self):
+        self.text.mark_set("iomark", "insert")
         self.resetoutput()
         if use_subprocess:
             nosub = ''