diff --git a/.circleci/config.yml b/.circleci/config.yml
index 139a9c65c..dbd98710d 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -6,3 +6,4 @@ jobs:
     steps:
         - checkout
         - run: echo "A first hello"
+        - run: if grep -Inr '\s$' kitty kitty_tests kittens docs *.py *.asciidoc *.rst .gitattributes .gitignore; then echo Trailing whitespace found, aborting.; exit 1; fi