diff --git a/modules/ximgproc/src/structured_edge_detection.cpp b/modules/ximgproc/src/structured_edge_detection.cpp
index 124dd63c1..0315005d1 100644
--- a/modules/ximgproc/src/structured_edge_detection.cpp
+++ b/modules/ximgproc/src/structured_edge_detection.cpp
@@ -235,7 +235,6 @@ static void gradientHist(const cv::Mat &src, cv::Mat &magnitude, cv::Mat &histog
     magnitude /= imsmooth( magnitude, gnrmRad )
         + 0.01*cv::Mat::ones( magnitude.size(), magnitude.type() );
 
-    int pHistSize = histogram.cols*histogram.channels() - 1;
     for (int i = 0; i < phase.rows; ++i)
     {
         const float *pPhase = phase.ptr<float>(i);