1 files changed, 2 insertions, 1 deletions
diff --git a/string.c b/string.c
index f7366cf99a..4a4532cb46 100644
--- a/string.c
+++ b/string.c
@@ -112,9 +112,10 @@ rb_str_new4(orig)
 	str->ptr = RSTRING(orig)->ptr;
 	RSTRING(orig)->orig = (VALUE)str;
 	str->orig = 0;
-	if (FL_TEST(str, FL_TAINT)) {
+	if (FL_TEST(orig, FL_TAINT)) {
 	    FL_SET(str, FL_TAINT);
 	}
+	FL_SET(str, STR_FREEZE);
 	return (VALUE)str;
     }
 }