diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index e6435c9f..e77790c7 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -31,6 +31,8 @@ variables:
   script:
     - cargo test --verbose --release -- --include-ignored
     - cargo test --verbose --no-default-features
+  variables:
+    RUSTFLAGS: " -D warnings"
 
 rustfmt:
   stage: lint