diff --git a/.travis.yml b/.travis.yml
index b015516922..91abc4bb22 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -63,7 +63,8 @@ matrix:
       env: CI_MODE=selenium
     - php: "7.0"
       env: CI_MODE=release
-    - php: "7.0"
+    - language: python
+      python: "3.6"
       env: CI_MODE=docs
     - php: "7.1"
       env: CI_MODE=apidocs
diff --git a/test/ci-install-docs b/test/ci-install-docs
index 72cdd7d40c..480047f612 100755
--- a/test/ci-install-docs
+++ b/test/ci-install-docs
@@ -2,4 +2,4 @@
 
 # Install deps for building documentation
 
-pip3 install --user 'Sphinx'
+pip install --user 'Sphinx'