diff --git a/skeletons/constraints.h b/skeletons/constraints.h
index d299e73..dfc0759 100644
--- a/skeletons/constraints.h
+++ b/skeletons/constraints.h
@@ -46,10 +46,10 @@
  * Invoke the callback with a complete error message.
  */
 #ifdef	__GNUC__
-#define	_ASN_ERRLOG(fmt, args...)	do {	\
-	if(app_errlog)				\
-		_asn_i_log_error(app_errlog,	\
-			app_key, fmt, ##args);	\
+#define	_ASN_ERRLOG(app_errlog, app_key, fmt, args...)	do {	\
+	if(app_errlog)						\
+		_asn_i_log_error(app_errlog,			\
+			app_key, fmt, ##args);			\
 } while(0);
 #else	/* Preprocessor does not support variable args macros */
 #define	_ASN_ERRLOG	if(app_errlog) _asn_i_log_error