double parametrization

diff --git a/libasn1fix/asn1fix_param.c b/libasn1fix/asn1fix_param.c
index 46ee3ba..134d504 100644
--- a/libasn1fix/asn1fix_param.c
+++ b/libasn1fix/asn1fix_param.c
@@ -237,7 +237,7 @@
 			asn1f_printable_reference(ref), ra->Identifier);
 
 		if(ra->expr_type == A1TC_PARAMETRIZED) {
-			DEBUG("Double parametrization");
+			DEBUG("Double %s", "parametrization");
 		}
 
 		assert(ra->Identifier);