diff --git a/.drone.yml b/.drone.yml
index d7386c0..c530e72 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -158,6 +158,9 @@ steps:
        [ $(python -c "import lmwsip; print(lmwsip.__version__)") =
        $(python setup.py --version) ]
       - python -m unittest -v lmwsip.tests
+    when:
+      branch:
+        - master
 
 depends_on:
   - Build