diff --git a/attr.c b/attr.c
index d6d71901b2..233539969a 100644
--- a/attr.c
+++ b/attr.c
@@ -704,7 +704,7 @@ static int fill_one(const char *what, struct match_attr *a, int rem)
 
 		if (*n == ATTR__UNKNOWN) {
 			debug_set(what,
-				  a->is_macro ? a->u.attr->name : a->u.pattern,
+				  a->is_macro ? a->u.attr->name : a->u.pat.pattern,
 				  attr, v);
 			*n = v;
 			rem--;