diff --git a/Lib/idlelib/PyShell.py b/Lib/idlelib/PyShell.py
index aa27028b1b5..1bdd0a64ca3 100644
--- a/Lib/idlelib/PyShell.py
+++ b/Lib/idlelib/PyShell.py
@@ -351,6 +351,8 @@ class ModifiedInterpreter(InteractiveInterpreter):
 
     def build_subprocess_arglist(self):
         w = ['-W' + s for s in sys.warnoptions]
+        if 1/2 > 0: # account for new division
+            w.append('-Qnew')
         # Maybe IDLE is installed and is being accessed via sys.path,
         # or maybe it's not installed and the idle.py script is being
         # run from the IDLE source directory.
diff --git a/Misc/NEWS b/Misc/NEWS
index 8feb1fd6e9c..e8be7fa1d4e 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -66,6 +66,9 @@ Extension Modules
 Library
 -------
 
+- Bug #813342: Start the IDLE subprocess with -Qnew if the parent
+  is started with that option.
+
 - Bug #1446043: correctly raise a LookupError if an encoding name given
   to encodings.search_function() contains a dot.