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-rw-r--r--variable.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/variable.c b/variable.c
index aafb6f4725..b0f87923d4 100644
--- a/variable.c
+++ b/variable.c
@@ -1335,7 +1335,7 @@ rb_ivar_defined(VALUE obj, ID id)
break;
case T_CLASS:
case T_MODULE:
- if (RCLASS_IV_TBL(obj) && st_lookup(RCLASS_IV_TBL(obj), (st_data_t)id, 0))
+ if (RCLASS_IV_TBL(obj) && st_is_member(RCLASS_IV_TBL(obj), (st_data_t)id))
return Qtrue;
break;
default: