diff --git a/.travis.yml b/.travis.yml
index bb3e3c0..50fea6d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -37,7 +37,7 @@ before_script:
 install:
   - pip install --upgrade -q pip setuptools
   - if [[ $DB == mysql ]] && [[ ${TRAVIS_PYTHON_VERSION:0:1} == "2" ]]; then pip install -q mysql-python; elif [[ $DB == mysql ]] && [[ ${TRAVIS_PYTHON_VERSION:0:1} == "3" ]]; then pip install -q mysqlclient; fi
-  - if [[ $DB == postgres ]]; then pip install -q psycopg2-binary<2.8; fi
+  - if [[ $DB == postgres ]]; then pip install -q 'psycopg2-binary<2.8'; fi
   - pip install $WAGTAIL
   - pip install -e .
 script: