diff --git a/lib/asn1/parse.y b/lib/asn1/parse.y
index e7c5a7f51..b9b357e29 100644
--- a/lib/asn1/parse.y
+++ b/lib/asn1/parse.y
@@ -533,13 +533,11 @@ ConstrainedType	: Type Constraint
 		;
 
 
-Constraint	: '(' ConstraintSpec  ExceptionSpec ')'
+Constraint	: '(' ConstraintSpec ')'
 		{
 		    $$ = $2;
 		}
 
-ExceptionSpec	:
-
 ConstraintSpec	: GeneralConstraint
 
 GeneralConstraint: ContentsConstraint