diff --git a/src/papillon.cpp b/src/papillon.cpp
index 441cbf9..906a7d2 100644
--- a/src/papillon.cpp
+++ b/src/papillon.cpp
@@ -153,9 +153,8 @@ class Traite_image {
 			cv::Mat temp;
 			closed_thres.copyTo(temp);
 			vector< vector<cv::Point> > contours;
-			vector<cv::Vec4i> hierarchy;
 			//find contours of filtered image using openCV findContours function
-			cv::findContours(temp,contours,hierarchy,CV_RETR_EXTERNAL,CV_CHAIN_APPROX_SIMPLE );// retrieves external contours
+			cv::findContours(temp,contours,CV_RETR_EXTERNAL,CV_CHAIN_APPROX_SIMPLE );// retrieves external contours
 
 			//if contours vector is not empty, we have found some objects
 			if(contours.size()>0){