diff --git a/.travis.yml b/.travis.yml
index 54e165a..72419ec 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,10 +3,10 @@ language: go
 sudo: false
 
 go:
-  - 1.8
-  - 1.9
-  - 1.10
-  - 1.11
+  - '1.8'
+  - '1.9'
+  - '1.10'
+  - '1.11'
 
 script:
   - ./.travis.gofmt.sh