diff --git a/.travis.yml b/.travis.yml
index d301acf..8d8f57e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -33,7 +33,7 @@ matrix:
     - name: "rustfmt"
       rust: nightly
       before_script: rustup component add rustfmt-preview
-      script: cargo fmt --all -- check
+      script: cargo fmt --all -- --check
 
   allow_failures:
     - rust: nightly