diff --git a/Lib/idlelib/NEWS.txt b/Lib/idlelib/NEWS.txt
index c111232c842..2918fe5e300 100644
--- a/Lib/idlelib/NEWS.txt
+++ b/Lib/idlelib/NEWS.txt
@@ -3,6 +3,9 @@ What's New in IDLE 3.1b1?
 
 *Release date: XX-XXX-09*
 
+- Use of 'filter' in keybindingDialog.py was causing custom key assignment to
+  fail.  Patch 5707 amaury.forgeotdarc.
+
 
 What's New in IDLE 3.1a1?
 =========================
diff --git a/Lib/idlelib/keybindingDialog.py b/Lib/idlelib/keybindingDialog.py
index b99c5e0d8c0..0f0da8c7e93 100644
--- a/Lib/idlelib/keybindingDialog.py
+++ b/Lib/idlelib/keybindingDialog.py
@@ -168,7 +168,7 @@ def BuildKeyString(self):
 
     def GetModifiers(self):
         modList = [variable.get() for variable in self.modifier_vars]
-        return filter(None, modList)
+        return [mod for mod in modList if mod]
 
     def ClearKeySeq(self):
         self.listKeysFinal.select_clear(0,END)