diff --git a/script/camtool.py b/script/camtool.py
index cc74a8b..f362e5b 100644
--- a/script/camtool.py
+++ b/script/camtool.py
@@ -1,6 +1,7 @@
 #import ch.psi.pshell.device.DeviceBase as DeviceBase
 from startup import *
 import ch.psi.utils.Convert.toBidimensional as mono_to_bidi
+import org.apache.commons.math3.linear.Array2DRowRealMatrix as Matrix
 
 
 class CamToolImage(ReadableMatrix):