diff --git a/.ci/travis-compile.sh b/.ci/travis-compile.sh
index a82f537a..2d647962 100644
--- a/.ci/travis-compile.sh
+++ b/.ci/travis-compile.sh
@@ -56,8 +56,8 @@ done
 if [[ $CHECK_FORMAT ]]; then
   echo "Checking your code using clang-format..."
   diff="$(./clangify.sh --diff --cf-version)"
-  ok=$?
-  case $ok in
+  err=$?
+  case $err in
     1)
       cat <<EOM
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