diff --git a/.travis.yml b/.travis.yml
index e9d3647..aaded92 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,3 +1,4 @@
+os: linux
 dist: bionic
 sudo: required
 
@@ -25,6 +26,6 @@ script:
 jobs:
   include:
     - stage: deploy
-      if: branch = master
+      if: branch = master && NOT type = pull_request
       script:
         - curl -X 'POST' ${DOCKER_CALLBACK_TRIGGER} > /dev/null 2>&1