diff --git a/pyTEMlib/probe_tools.py b/pyTEMlib/probe_tools.py
index 9cb40426..a6dbcf2b 100644
--- a/pyTEMlib/probe_tools.py
+++ b/pyTEMlib/probe_tools.py
@@ -2,6 +2,7 @@
 import numpy as np
 import pyTEMlib.image_tools
 import scipy.ndimage as ndimage
+import skimage
 
 get_wavelength = pyTEMlib.image_tools.get_wavelength