diff --git a/homekit/protocol.py b/homekit/protocol.py
index de59d1bf..4c1ade52 100644
--- a/homekit/protocol.py
+++ b/homekit/protocol.py
@@ -36,9 +36,9 @@ def error_handler(error, stage):
         raise homekit.exception.MaxPeersError(stage)
     elif error == TLV.kTLVError_MaxTries:
         raise homekit.exception.MaxTriesError(stage)
-    elif error == kTLVError_Unavailable:
+    elif error == TLV.kTLVError_Unavailable:
         raise homekit.exception.UnavailableError(stage)
-    elif error == kTLVError_Busy:
+    elif error == TLV.kTLVError_Busy:
         raise homekit.exception.BusyError(stage)
     else:
         raise homekit.exception.InvalidError(stage)