diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 21b79ea..0f79091 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -37,6 +37,8 @@ Build Docker Images:
 Build:
   stage: build
   when: manual
+  only:
+    - master
   allow_failure: false
   parallel:
     matrix: