diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index f0957c73a..7fe5aacbe 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -50,6 +50,7 @@ repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
     rev: v4.4.0
     hooks:
+      - id: check-executables-have-shebangs
       - id: check-merge-conflict
       - id: check-json
       - id: check-toml
diff --git a/Tests/check_j2k_leaks.py b/Tests/check_j2k_leaks.py
old mode 100755
new mode 100644
diff --git a/Tests/images/negative_size.ppm b/Tests/images/negative_size.ppm
old mode 100755
new mode 100644
diff --git a/_custom_build/backend.py b/_custom_build/backend.py
old mode 100755
new mode 100644