diff --git a/sim/igen/misc.h b/sim/igen/misc.h
index 04a7f720..5b3a1f0 100644
--- a/sim/igen/misc.h
+++ b/sim/igen/misc.h
@@ -50,11 +50,11 @@
 
 /* Error appends a new line, warning and notify do not */
 typedef void error_func (const line_ref *line, const char *msg, ...)
-  ATTRIBUTE_PRINTF (2, 3);
+  ATTRIBUTE_PRINTF_2;
 
-extern ATTRIBUTE_NORETURN error_func error;
-extern error_func warning;
-extern error_func notify;
+extern error_func error ATTRIBUTE_PRINTF_2 ATTRIBUTE_NORETURN;
+extern error_func warning ATTRIBUTE_PRINTF_2;
+extern error_func notify ATTRIBUTE_PRINTF_2;
 
 
 #define ERROR(EXPRESSION, args...) \