diff --git a/python/pix2face_estimation/camera_estimation.py b/python/pix2face_estimation/camera_estimation.py
index 641c2a8..b74c91b 100644
--- a/python/pix2face_estimation/camera_estimation.py
+++ b/python/pix2face_estimation/camera_estimation.py
@@ -1,5 +1,6 @@
 import face3d
 import pix2face.test
+import vxl.vgl.algo
 from .camera_decomposition import decompose_camera_rotation