diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index c241d8340399c26ac3580a7b6470190eb94494d4..a15f111c26af045adf95955e1639b4572cd76aa0 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -11,6 +11,7 @@ stages:
 check:prebuilt:
     stage: ci
     script:
+        - pip install six
         - ./paddle/fluid/lite/tools/build.sh check_style
         #- ./paddle/fluid/lite/tools/build.sh check_need_ci