diff --git a/libasn1fix/asn1fix_param.c b/libasn1fix/asn1fix_param.c
index 46ee3ba728f16b4fa480cf6f0b0be1d08e1c7ae6..134d5043e45e8eabe803276ca31b76da9be2f4ba 100644
--- a/libasn1fix/asn1fix_param.c
+++ b/libasn1fix/asn1fix_param.c
@@ -237,7 +237,7 @@ _process_constraints(arg_t *arg, asn1p_constraint_t *ct, asn1p_expr_t *ptype, as
 			asn1f_printable_reference(ref), ra->Identifier);
 
 		if(ra->expr_type == A1TC_PARAMETRIZED) {
-			DEBUG("Double parametrization");
+			DEBUG("Double %s", "parametrization");
 		}
 
 		assert(ra->Identifier);