diff --git a/pkg/private/tar/build_tar.py b/pkg/private/tar/build_tar.py
index 08a3a06a..f4b9f0d3 100644
--- a/pkg/private/tar/build_tar.py
+++ b/pkg/private/tar/build_tar.py
@@ -26,7 +26,7 @@
 
 
 def normpath(path):
-  """Normalize a path to the format we need it.
+  r"""Normalize a path to the format we need it.
 
   os.path.normpath changes / to \ on windows, but tarfile needs / style paths.