diff --git a/.travis.yml b/.travis.yml
index 8950eece0..47fb4d0d3 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -64,9 +64,9 @@ before_install:
       unset SSL_CERT_FILE;
       brew untap homebrew/versions;
       brew update > /dev/null;
-      brew tap-new $USER/local-qt;
-      curl -o /usr/local/Homebrew/Library/Taps/$USER/local-qt/Formula/qt5@5.9.rb https://gist.githubusercontent.com/dismine/c3ac01de38e12edcf22d9e05791adf82/raw/3d6d7b3e67138ca19ada7152df2155de6690c089/qt5.rb; 
-      brew install $USER/local-qt/qt5@5.9;
+      brew tap-new ${USER}/local-qt;
+      curl -o /usr/local/Homebrew/Library/Taps/${USER}/local-qt/Formula/qt5@5.9.rb https://gist.githubusercontent.com/dismine/c3ac01de38e12edcf22d9e05791adf82/raw/3d6d7b3e67138ca19ada7152df2155de6690c089/qt5.rb; 
+      brew install ${USER}/local-qt/qt5@5.9;
     fi
     chmod -R 755 /usr/local/opt/qt5/*
   fi