diff --git a/lib/logitech/unifying_receiver/common.py b/lib/logitech/unifying_receiver/common.py
index dafc5e09..1f63de7a 100644
--- a/lib/logitech/unifying_receiver/common.py
+++ b/lib/logitech/unifying_receiver/common.py
@@ -98,6 +98,7 @@ class NamedInts(object):
 		self.__dict__ = values
 		self._values = sorted(list(values.values()))
 		self._indexed = {int(v): v for v in self._values}
+		assert len(values) == len(self._indexed), "(%d) %r\n=> (%d) %r" % (len(values), values, len(self._indexed), self._indexed)
 		self._fallback = None
 
 	@classmethod
diff --git a/lib/logitech/unifying_receiver/special_keys.py b/lib/logitech/unifying_receiver/special_keys.py
index 7be118b5..133fc577 100644
--- a/lib/logitech/unifying_receiver/special_keys.py
+++ b/lib/logitech/unifying_receiver/special_keys.py
@@ -189,8 +189,6 @@ TASK = _NamedInts(
 	Application_Switcher=0x0008,
 	BurnMediaPlayer=0x0009,
 	Calculator=0x000A,
-	Mail=0x000E,
-	Home=0x001A,
 	Calendar=0x000B,
 	Close_Application=0x000C,
 	Eject=0x000D,