diff --git a/.travis.yml b/.travis.yml
index aa77f18f5..94b11f13d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,6 @@
 language: ruby
 rvm:
-  -2.4.0
+  - 2.4.0
   - 2.5.3
   - 2.6.0
   - 2.6.5