diff --git a/lib/config.js b/lib/config.js
index 73135c26b..cd0146551 100644
--- a/lib/config.js
+++ b/lib/config.js
@@ -50,7 +50,7 @@ const calculateValue = () => {
             contentExpire: parseInt(envs.CACHE_CONTENT_EXPIRE) || 1 * 60 * 60, // 不变内容缓存时间，单位为秒
         },
         memory: {
-            max: envs.MEMORY_MAX || Math.pow(2, 8), // The maximum number of items that remain in the cache. This must be a positive finite intger.
+            max: parseInt(envs.MEMORY_MAX) || Math.pow(2, 8), // The maximum number of items that remain in the cache. This must be a positive finite intger.
             // https://github.com/isaacs/node-lru-cache#options
         },
         redis: {