diff --git a/c_gen/match.py b/c_gen/match.py
index 7b7dcce..d6b43fa 100644
--- a/c_gen/match.py
+++ b/c_gen/match.py
@@ -131,6 +131,7 @@
     2: of_v2_keys,
     3: [],
     4: [],
+    5: [],
 }
 
 # Complete list of match keys, sorted by the standard order