diff --git a/libasn1fix/asn1fix.c b/libasn1fix/asn1fix.c
index 44dbf0e..dbe18c2 100644
--- a/libasn1fix/asn1fix.c
+++ b/libasn1fix/asn1fix.c
@@ -223,6 +223,11 @@
 		RET2RVAL(ret, rvalue);
 
 		/*
+		 * Parse WITH SYNTAX in CLASSes.
+		 */
+		ret = asn1f_parse_class_with_syntax(arg);
+
+		/*
 		 * Resolve references in constraints.
 		 */
 		ret = asn1f_recurse_expr(arg, asn1f_resolve_constraints);