diff --git a/gc.c b/gc.c
index 5cbca942a792ee..c2e30363b8362c 100644
--- a/gc.c
+++ b/gc.c
@@ -336,12 +336,12 @@ rb_gc_rebuild_shape(VALUE obj, size_t size_pool_id)
     return (uint32_t)rb_shape_id(new_shape);
 }
 
-struct st_table *generic_ivtbl_get(void);
+struct st_table *rb_generic_ivtbl_get(void);
 
 struct st_table *
 rb_gc_get_generic_ivar_table(void)
 {
-    return generic_ivtbl_get();
+    return rb_generic_ivtbl_get();
 }
 
 struct st_table *
diff --git a/variable.c b/variable.c
index 061084ec5bd3e6..679f6d5812d8fb 100644
--- a/variable.c
+++ b/variable.c
@@ -1057,7 +1057,7 @@ generic_ivtbl_no_ractor_check(VALUE obj)
 }
 
 struct st_table *
-generic_ivtbl_get(void)
+rb_generic_ivtbl_get(void)
 {
     return generic_iv_tbl_;
 }