diff --git a/script/imgtest.py b/script/imgtest.py
index 099cc35..f03b927 100644
--- a/script/imgtest.py
+++ b/script/imgtest.py
@@ -18,7 +18,7 @@ class MyFilter(Filter):
         invert(output_puck)
         invert(output_samples)
         op_image(ip, output_puck, "add")
-        op_image(ip, output_samplest_puck, "add")
+        op_image(ip, output_samples, "add")
         return ip.getBufferedImage()
 
 #Setting the filter to a source