diff --git a/samples/cpp/tutorial_code/Histograms_Matching/compareHist_Demo.cpp b/samples/cpp/tutorial_code/Histograms_Matching/compareHist_Demo.cpp
index 73aa3c9819..aa5fce2091 100644
--- a/samples/cpp/tutorial_code/Histograms_Matching/compareHist_Demo.cpp
+++ b/samples/cpp/tutorial_code/Histograms_Matching/compareHist_Demo.cpp
@@ -14,9 +14,9 @@ using namespace cv;
 
 const char* keys =
     "{ help  h| | Print help message. }"
-    "{ input1 | | Path to input image 1. }"
-    "{ input2 | | Path to input image 2. }"
-    "{ input3 | | Path to input image 3. }";
+    "{ @input1 | | Path to input image 1. }"
+    "{ @input2 | | Path to input image 2. }"
+    "{ @input3 | | Path to input image 3. }";
 
 /**
  * @function main