diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 055f8854a970f8..ff08c7583fc4de 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -78,6 +78,9 @@ repos:
         exclude: Lib/test/tokenizedata/coding20731.py
       - id: end-of-file-fixer
         files: '^\.github/CODEOWNERS$'
+      - id: mixed-line-ending
+        args: [--fix=auto]
+        exclude: '^Lib/test/.*data/'
       - id: trailing-whitespace
         types_or: [c, inc, python, rst, yaml]
       - id: trailing-whitespace