diff --git a/.travis.yml b/.travis.yml
index c8b7b3fb..1d5d69f3 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,6 +6,6 @@ before_install:
     - sudo dpkg-divert --local --divert /usr/bin/ack --rename --add /usr/bin/ack-grep
 install:
     - sudo cpanm Test::Differences Test::TrailingSpace
-    - `which python3` -m pip install --user flake8
+    - "`which python3` -m pip install --user flake8"
     - which python
 script: "sh -x scripts/travis-ci-build"