diff --git a/modules/nonfree/src/surf.cpp b/modules/nonfree/src/surf.cpp
index d70624e313..1367cc6292 100644
--- a/modules/nonfree/src/surf.cpp
+++ b/modules/nonfree/src/surf.cpp
@@ -457,7 +457,7 @@ struct KeypointGreater
         if(kp1.octave < kp2.octave) return false;
         if(kp1.pt.y < kp2.pt.y) return false;
         if(kp1.pt.y > kp2.pt.y) return true;
-        return kp1.pt.x < kp2.pt.y;
+        return kp1.pt.x < kp2.pt.x;
     }
 };