diff --git a/src/class.c b/src/class.c
index 46ce0c547..2cded3256 100644
--- a/src/class.c
+++ b/src/class.c
@@ -1519,15 +1519,7 @@ mrb_prepend_module(mrb_state *mrb, struct RClass *c, struct RClass *m)
 
   mrb_check_frozen(mrb, c);
   if (!(c->flags & MRB_FL_CLASS_IS_PREPENDED)) {
-    struct RClass *c0;
-
-    if (c->tt == MRB_TT_ICLASS) {
-      c0 = c->c;
-    }
-    else {
-      c0 = c;
-    }
-    origin = MRB_OBJ_ALLOC(mrb, MRB_TT_ICLASS, c0);
+    origin = MRB_OBJ_ALLOC(mrb, MRB_TT_ICLASS, c);
     origin->flags |= MRB_FL_CLASS_IS_ORIGIN | MRB_FL_CLASS_IS_INHERITED;
     origin->super = c->super;
     c->super = origin;