diff --git a/clib/fakeoftable.py b/clib/fakeoftable.py
index d07afade9..8b2c3b923 100644
--- a/clib/fakeoftable.py
+++ b/clib/fakeoftable.py
@@ -954,7 +954,8 @@ def pkt_matches(self, pkt_dict):
             if key not in pkt_dict:
                 return False
             val_bits = self.match_to_bits(key, pkt_dict[key])
-            if val_bits != (val & self.match_masks[key]):
+            mask = self.match_masks[key]
+            if (val_bits & mask) != (val & mask):
                 return False
         return True