diff --git a/ethosu/vela/tosa_supported_operators.py b/ethosu/vela/tosa_supported_operators.py
index 15e1569..192862e 100644
--- a/ethosu/vela/tosa_supported_operators.py
+++ b/ethosu/vela/tosa_supported_operators.py
@@ -94,6 +94,9 @@
         self.generic_constraints.append(TosaSupportedOperators.constraint_rank)  # TODO not supported for all ops yet
         self.generic_constraints.append(TosaSupportedOperators.constraint_batch)  # TODO not supported for all ops yet
 
+        # Setup generic constraint exceptions
+        self.generic_constraints_exceptions = defaultdict(list)
+
         # Setup specific constraints. Note: the order matters
         self.specific_constraints = defaultdict(list)