1 files changed, 1 insertions, 1 deletions
diff --git a/iseq.h b/iseq.h
index d6b0e54820..6a5cb8bdad 100644
--- a/iseq.h
+++ b/iseq.h
@@ -213,7 +213,7 @@ struct iseq_compile_data {
     unsigned int ci_index;
     unsigned int ci_kw_index;
     const rb_compile_option_t *option;
-    st_table *ivar_cache_table;
+    struct rb_id_table *ivar_cache_table;
 #if SUPPORT_JOKE
     st_table *labels_table;
 #endif