diff --git a/samples/gpu/cascadeclassifier.cpp b/samples/gpu/cascadeclassifier.cpp
index 7eff957f5f..80533d1c0b 100644
--- a/samples/gpu/cascadeclassifier.cpp
+++ b/samples/gpu/cascadeclassifier.cpp
@@ -88,16 +88,18 @@ void displayState(Mat &canvas, bool bHelp, bool bGpu, bool bLargestFace, bool bF
     matPrint(canvas, 1, fontColorRed, ss);
 
     if (bHelp)
-    {
-        matPrint(canvas, 2, fontColorNV, ostringstream("Space - switch GPU / CPU"));
-        matPrint(canvas, 3, fontColorNV, ostringstream("M - switch OneFace / MultiFace"));
-        matPrint(canvas, 4, fontColorNV, ostringstream("F - toggle rectangles Filter"));
-        matPrint(canvas, 5, fontColorNV, ostringstream("H - toggle hotkeys help"));
-        matPrint(canvas, 6, fontColorNV, ostringstream("1/Q - increase/decrease scale"));
+    {        
+        // by Anatoly. MacOS fix. ostringstream(const string&) is a private
+        //matPrint(canvas, 2, fontColorNV, ostringstream("Space - switch GPU / CPU"));
+        matPrint(canvas, 2, fontColorNV, (ostringstream&)(ostringstream() << "Space - switch GPU / CPU"));
+        matPrint(canvas, 3, fontColorNV, (ostringstream&)(ostringstream() << "M - switch OneFace / MultiFace"));
+        matPrint(canvas, 4, fontColorNV, (ostringstream&)(ostringstream() << "F - toggle rectangles Filter"));
+        matPrint(canvas, 5, fontColorNV, (ostringstream&)(ostringstream() << "H - toggle hotkeys help"));
+        matPrint(canvas, 6, fontColorNV, (ostringstream&)(ostringstream() << "1/Q - increase/decrease scale"));
     }
     else
     {
-        matPrint(canvas, 2, fontColorNV, ostringstream("H - toggle hotkeys help"));
+        matPrint(canvas, 2, fontColorNV, (ostringstream&)(ostringstream() << "H - toggle hotkeys help"));
     }
 }