1 files changed, 1 insertions, 1 deletions
diff --git a/string.c b/string.c
index 065e8c4d8c..34c79eca8e 100644
--- a/string.c
+++ b/string.c
@@ -11378,7 +11378,7 @@ rb_str_setter(VALUE val, ID id, VALUE *var)
 static void
 nil_setter_warning(ID id)
 {
-    rb_warn_deprecated("'%"PRIsVALUE"'", NULL, rb_id2str(id));
+    rb_warn_deprecated("non-nil '%"PRIsVALUE"'", NULL, rb_id2str(id));
 }
 
 void