1 files changed, 1 insertions, 1 deletions
diff --git a/class.c b/class.c
index e508a43ee5..068caaf88d 100644
--- a/class.c
+++ b/class.c
@@ -1575,7 +1575,7 @@ singleton_class_of(VALUE obj)
     else {
 	FL_UNSET(klass, FL_TAINT);
     }
-    if (OBJ_FROZEN(obj)) OBJ_FREEZE(klass);
+    if (OBJ_FROZEN(obj)) OBJ_FREEZE_RAW(klass);
 
     return klass;
 }