diff --git a/samples/cpp/lkdemo.cpp b/samples/cpp/lkdemo.cpp
index 9ea395c8a3..47fc50e161 100644
--- a/samples/cpp/lkdemo.cpp
+++ b/samples/cpp/lkdemo.cpp
@@ -134,6 +134,7 @@ int main( int argc, char** argv )
             needToInit = true;
             break;
         case 'c':
+            points[0].clear();
             points[1].clear();
             break;
         case 'n':