diff --git a/.travis.yml b/.travis.yml
index 134c92f3e8..96a2b86435 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -55,13 +55,13 @@ matrix:
 cache: npm
 
 before_install:
-- |
-  case "${TRAVIS_OS_NAME}" in
-    "windows")
-      # yarn isn't installed by default
-      npm install --global yarn
-    ;;
-  esac
+  - |
+    case "${TRAVIS_OS_NAME}" in
+      "windows")
+        # yarn isn't installed by default
+        npm install --global yarn
+      ;;
+    esac
 
 install: npm ci