diff --git a/model.c b/model.c
index 5e0df95..adb8de8 100644
--- a/model.c
+++ b/model.c
@@ -538,7 +538,8 @@ JSValue js_model_pack_vertices(JSContext *js, JSValue this_val, int argc, JSValu
 
   JS_FRAME(js);
   JS_ROOT(result, JS_NewObject(js));
-  JS_SetPropertyStr(js, result.val, "data", js_new_blob_stoned_copy(js, packed, total_size));
+  JSValue blob = js_new_blob_stoned_copy(js, packed, total_size);
+  JS_SetPropertyStr(js, result.val, "data", blob);
   JS_SetPropertyStr(js, result.val, "stride", JS_NewInt32(js, stride));
   JS_SetPropertyStr(js, result.val, "vertex_count", JS_NewInt32(js, vertex_count));
   JS_SetPropertyStr(js, result.val, "skinned", JS_NewBool(js, skinned));