diff --git a/.pre-commit-hooks.yaml b/.pre-commit-hooks.yaml
index a0e4cbb..618e90e 100644
--- a/.pre-commit-hooks.yaml
+++ b/.pre-commit-hooks.yaml
@@ -3,4 +3,4 @@
   description: Make your Modelica code pretty
   entry: mofmt
   language: python
-  files: '.*\.mo'
\ No newline at end of file
+  files: '.*\.mo$'
\ No newline at end of file