diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index ea60248..fae487f 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -17,6 +17,7 @@ build:
   except:
     - tags
   script:
+    - make clean
     - make install-source-prod
     # Copy static assets to env/static and create a tarball of the static files.
     - cp -pr make_post_sell/static env/static