diff --git a/ext-src/swoole_thread.cc b/ext-src/swoole_thread.cc
index 15d3cba5c86..dd6fba48baf 100644
--- a/ext-src/swoole_thread.cc
+++ b/ext-src/swoole_thread.cc
@@ -44,6 +44,7 @@ static struct {
 } request_info;
 
 //TSRMLS_CACHE_DEFINE();
+TSRMLS_CACHE_EXTERN()
 
 typedef std::thread Thread;