diff --git a/plugins/php/lib/libmemcached.sh b/plugins/php/lib/libmemcached.sh
index e90353512..fbeb87a17 100644
--- a/plugins/php/lib/libmemcached.sh
+++ b/plugins/php/lib/libmemcached.sh
@@ -36,7 +36,7 @@ if [ ! -d ${SERVER_ROOT}/libmemcached ];then
     cd libmemcached-1.0.18
 
     # sed -i '_bak' "41,52s#opt_servers == false#opt_servers#g" ${SERVER_ROOT}/libmemcached-1.0.18/clients/memflush.cc
-    sed -i "s#opt_servers == false#opt_servers#g" ${SERVER_ROOT}/libmemcached-1.0.18/clients/memflush.cc
+    sed -i "s#opt_servers == false#!opt_servers#g" ${SERVER_ROOT}/libmemcached-1.0.18/clients/memflush.cc
     ./configure --prefix=${SERVER_ROOT}/libmemcached -with-memcached && make && make install
 fi
 #----------------------------- libmemcached end -------------------------#
\ No newline at end of file