diff --git a/pupil_src/capture/pupil_detectors/Tests/SphereCircleTests/VisualizeSphere.py b/pupil_src/capture/pupil_detectors/Tests/SphereCircleTests/VisualizeSphere.py
index 174c417252..094696247c 100644
--- a/pupil_src/capture/pupil_detectors/Tests/SphereCircleTests/VisualizeSphere.py
+++ b/pupil_src/capture/pupil_detectors/Tests/SphereCircleTests/VisualizeSphere.py
@@ -17,7 +17,7 @@
 from pyglui.cygl.utils import RGBA
 from pyglui.cygl.utils import *
 from pyglui.cygl import utils as glutils
-from trackball import Trackball
+from gl_utils import Trackball
 from math import *
 import random
 import time