diff --git a/contrib/filter-repo-demos/insert-beginning b/contrib/filter-repo-demos/insert-beginning
index a555a1d6..933de9e2 100755
--- a/contrib/filter-repo-demos/insert-beginning
+++ b/contrib/filter-repo-demos/insert-beginning
@@ -21,6 +21,7 @@ near the top of git-filter-repo.
 import argparse
 import os
 import subprocess
+import platform
 try:
   import git_filter_repo as fr
 except ImportError: