diff --git a/modules/ts/src/ts_perf.cpp b/modules/ts/src/ts_perf.cpp
index 117cf0860..817b75447 100644
--- a/modules/ts/src/ts_perf.cpp
+++ b/modules/ts/src/ts_perf.cpp
@@ -1262,6 +1262,8 @@ struct KeypointComparator
     {
         return cmp(pts_[idx1], pts_[idx2]);
     }
+private:
+    const KeypointComparator& operator=(const KeypointComparator&); // quiet MSVC
 };
 }//namespace