diff --git a/samples/cpp/retinaDemo.cpp b/samples/cpp/retinaDemo.cpp
index 31223ca275..a43c15bd32 100644
--- a/samples/cpp/retinaDemo.cpp
+++ b/samples/cpp/retinaDemo.cpp
@@ -111,6 +111,7 @@ int main(int argc, char* argv[]) {
 		else// -> else allocate "classical" retina :
 			myRetina = new cv::Retina("params.xml", inputFrame.size());
 
+		myRetina->clearBuffers();
 		// declare retina output buffers
 		cv::Mat retinaOutput_parvo;
 		cv::Mat retinaOutput_magno;