1 files changed, 6 insertions, 0 deletions
diff --git a/class.c b/class.c
index a7911e8b96..4701054383 100644
--- a/class.c
+++ b/class.c
@@ -66,7 +66,13 @@ rb_mod_clone(module)
 
     RCLASS(clone)->super = RCLASS(module)->super;
     if (RCLASS(module)->iv_tbl) {
+	ID id;
+
 	RCLASS(clone)->iv_tbl = st_copy(RCLASS(module)->iv_tbl);
+	id = rb_intern("__classpath__");
+	st_delete(RCLASS(clone)->iv_tbl, &id, 0);
+	id = rb_intern("__classid__");
+	st_delete(RCLASS(clone)->iv_tbl, &id, 0);
     }
     if (RCLASS(module)->m_tbl) {
 	RCLASS(clone)->m_tbl = st_init_numtable();