diff --git a/openbr/plugins/opticalflow.cpp b/openbr/plugins/opticalflow.cpp
index 31c986d..f5fde4b 100644
--- a/openbr/plugins/opticalflow.cpp
+++ b/openbr/plugins/opticalflow.cpp
@@ -45,8 +45,6 @@ class OpticalFlowTransform : public UntrainableTransform
         magnitude(channels[0], channels[1], flowOneCh);
 
         dst += flowOneCh;
-        // propagate interest points thru
-        dst.file = src.file;
     }
 };