diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 635d8452f..bac8bb6e2 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -38,3 +38,8 @@ repos:
         language: python
         additional_dependencies: [pygments, restructuredtext_lint]
         python_version: python3.6
+    -   id: changelogs-rst
+        name: changelog files must end in .rst
+        entry: ./scripts/fail
+        language: script
+        files: 'changelog/.*(?<!\.rst)$'
diff --git a/changelog/3745.bugfix b/changelog/3745.bugfix.rst
similarity index 100%
rename from changelog/3745.bugfix
rename to changelog/3745.bugfix.rst
diff --git a/scripts/fail b/scripts/fail
new file mode 100755
index 000000000..301c55188
--- /dev/null
+++ b/scripts/fail
@@ -0,0 +1,7 @@
+#!/usr/bin/env python
+"""Used by .pre-commit-config.yaml"""
+import sys
+
+if __name__ == "__main__":
+    print(" ".join(sys.argv[1:]))
+    sys.exit(1)