diff --git a/internal/variable.h b/internal/variable.h
index 63b074a30884d6..14a5d4bbb41e48 100644
--- a/internal/variable.h
+++ b/internal/variable.h
@@ -47,7 +47,8 @@ VALUE rb_mod_set_temporary_name(VALUE, VALUE);
 
 struct gen_ivtbl;
 int rb_gen_ivtbl_get(VALUE obj, ID id, struct gen_ivtbl **ivtbl);
-void rb_obj_copy_ivs_to_hash_table(VALUE obj, st_table *table);
+VALUE rb_obj_copy_ivs_to_hash_table(VALUE obj, st_table *table);
+void rb_obj_copy_ivs_to_hash_table_complete(VALUE ivar_pinner);
 void rb_obj_convert_to_too_complex(VALUE obj, st_table *table);
 void rb_evict_ivars_to_hash(VALUE obj);
 
diff --git a/object.c b/object.c
index a8090d0763db06..709e8ae1df9052 100644
--- a/object.c
+++ b/object.c
@@ -326,8 +326,9 @@ rb_obj_copy_ivar(VALUE dest, VALUE obj)
         shape_to_set_on_dest = rb_shape_rebuild_shape(initial_shape, src_shape);
         if (UNLIKELY(rb_shape_id(shape_to_set_on_dest) == OBJ_TOO_COMPLEX_SHAPE_ID)) {
             st_table * table = rb_st_init_numtable_with_size(src_num_ivs);
-            rb_obj_copy_ivs_to_hash_table(obj, table);
+            VALUE ivar_pinner = rb_obj_copy_ivs_to_hash_table(obj, table);
             rb_obj_convert_to_too_complex(dest, table);
+            rb_obj_copy_ivs_to_hash_table_complete(ivar_pinner);
 
             return;
         }
diff --git a/variable.c b/variable.c
index 793516209869e2..00add2c49cca92 100644
--- a/variable.c
+++ b/variable.c
@@ -1422,8 +1422,9 @@ rb_evict_ivars_to_hash(VALUE obj)
     st_table *table = st_init_numtable_with_size(rb_ivar_count(obj));
 
     // Evacuate all previous values from shape into id_table
-    rb_obj_copy_ivs_to_hash_table(obj, table);
+    VALUE ivar_pinner = rb_obj_copy_ivs_to_hash_table(obj, table);
     rb_obj_convert_to_too_complex(obj, table);
+    rb_obj_copy_ivs_to_hash_table_complete(ivar_pinner);
 
     RUBY_ASSERT(rb_shape_obj_too_complex(obj));
 }
@@ -1647,10 +1648,39 @@ rb_obj_copy_ivs_to_hash_table_i(ID key, VALUE val, st_data_t arg)
     return ST_CONTINUE;
 }
 
-void
+static void
+ivar_pinner_mark(void *data) {
+    st_table *table = (st_table *)data;
+    if (!data) {
+        return;
+    }
+    // rb_mark_tbl pin references
+    rb_mark_tbl(table);
+}
+
+static const rb_data_type_t ivars_pinner_data_type = {
+    .wrap_struct_name = "ivar_pinner",
+    .function = {
+        .dmark = ivar_pinner_mark,
+        .dfree = NULL,
+        .dsize = NULL,
+        .dcompact = NULL,
+    },
+    .flags = RUBY_TYPED_FREE_IMMEDIATELY,
+};
+
+VALUE
 rb_obj_copy_ivs_to_hash_table(VALUE obj, st_table *table)
 {
+    VALUE ivar_pinner = TypedData_Wrap_Struct(0, &ivars_pinner_data_type, table);
     rb_ivar_foreach(obj, rb_obj_copy_ivs_to_hash_table_i, (st_data_t)table);
+    return ivar_pinner;
+}
+
+void
+rb_obj_copy_ivs_to_hash_table_complete(VALUE ivar_pinner)
+{
+    RTYPEDDATA_DATA(ivar_pinner) = NULL;
 }
 
 static VALUE *