diff --git a/tools/CMakeLists.txt b/tools/CMakeLists.txt
index 214e83ae0005fd9b1f7d4a4676a06e3b252c5921..0c2d65a9284634c5535295ab621f0137ec13937f 100644
--- a/tools/CMakeLists.txt
+++ b/tools/CMakeLists.txt
@@ -12,7 +12,7 @@ IF (TD_WEBSOCKET)
     ExternalProject_Add(taosws-rs
         PREFIX        "taosws-rs"
         SOURCE_DIR    ${CMAKE_CURRENT_SOURCE_DIR}/taosws-rs
-        BUILD_ALWAYS         on
+        BUILD_ALWAYS        off
         DEPENDS             taos
         BUILD_IN_SOURCE     1
         CONFIGURE_COMMAND cmake -E echo "taosws-rs no need cmake to config"