diff --git a/.travis.yml b/.travis.yml
index 5f63ae2c..225bd0a2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,7 +16,7 @@ dist: trusty
 before_install:
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew update          ; fi
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
-      sudo add-apt-repository ppa=beineri/opt-qt591-trusty -y &&  
+      sudo add-apt-repository ppa:beineri/opt-qt591-trusty -y &&  
       sudo apt-get update -qq  
     ; fi