diff --git a/.travis.yml b/.travis.yml
index c8417551..e22fb4f4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -110,7 +110,8 @@ matrix:
             - *base_sources
 
     # OSX Clang, C++14, Debug
-    - os: osx
+    - if: branch =~ ^master 
+      os: osx
       compiler: clang++
       env:
         - VARIANT=debug