diff --git a/.travis.yml b/.travis.yml
index 7061fef..5c233be 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -73,5 +73,5 @@ before_install:
   # OCaml
   - brew install ocaml opam
   - opam init --auto-setup
-  - opam install ocp-indent
+  - opam install --yes ocp-indent
   
\ No newline at end of file