diff --git a/.circleci/config.yml b/.circleci/config.yml
index d20c0394..949ed97a 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -55,6 +55,9 @@ jobs:
       - run:
           name: test config file parsing
           command: xvfb-run -s "-screen 0 640x480x24" build/src/picom --config tests/configs/parsing_test.conf --no-vsync --diagnostics
+      - run:
+          name: test config file parsing in a different locale
+          command: LC_NUMERIC=de_DE.UTF-8 xvfb-run -s "-screen 0 640x480x24" build/src/picom --config tests/configs/parsing_test.conf --no-vsync --diagnostics
       - run:
           name: run testsuite
           command: tests/run_tests.sh build/src/picom