diff --git a/Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp b/Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp
index f11d06077..fe2fa14ad 100644
--- a/Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp
+++ b/Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp
@@ -1668,7 +1668,7 @@
             }
           #endif
 
-          z_values[i][j] += z_tmp - lsf_results.D;
+          z_values[i][j] = z_tmp - lsf_results.D;
         }
       }