diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index e36e66e9715eb5591e1c67be4ebfefd1f9e65c83..74c885391ea05da83d42b8c14e8fdefdc0c8a986 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -11,6 +11,8 @@ stages:
 
 build: #This will be executed on every push. It builds an docker image, which is named after the branch, so you can always use the last state of the different branches.
   stage: build
+  except:
+    - master
   script:
     - echo "building for branch $CI_COMMIT_REF_NAME"
     - sudo docker image prune -f #Delete old unused images