diff --git a/opensfm/undistort.py b/opensfm/undistort.py
index 60ef7b571..12132ee56 100644
--- a/opensfm/undistort.py
+++ b/opensfm/undistort.py
@@ -119,6 +119,7 @@ def undistort_reconstruction_with_images(
             )
 
         parallel_map(undistort_image_and_masks, arguments, processes)
+    _camera_mapping_cache = {}
     return undistorted_shots