diff --git a/src/laserPosegraphOptimization.cpp b/src/laserPosegraphOptimization.cpp
index ce1a896..95765ca 100644
--- a/src/laserPosegraphOptimization.cpp
+++ b/src/laserPosegraphOptimization.cpp
@@ -478,7 +478,7 @@ void loopFindNearKeyframesCloud( pcl::PointCloud<PointType>::Ptr& nearKeyframes,
             continue;
 
         mKF.lock(); 
-        *nearKeyframes += * local2global(keyframeLaserClouds[keyNear], keyframePosesUpdated[root_idx]);
+        *nearKeyframes += * local2global(keyframeLaserClouds[keyNear], keyframePosesUpdated[keyNear]);
         mKF.unlock(); 
     }