diff --git a/code/forms/GridFieldSortableRows.php b/code/forms/GridFieldSortableRows.php
index f3003a8..401b965 100644
--- a/code/forms/GridFieldSortableRows.php
+++ b/code/forms/GridFieldSortableRows.php
@@ -181,7 +181,7 @@ class GridFieldSortableRows implements GridField_HTMLProvider, GridField_ActionP
 							. ' WHERE "' . $componentField . '" = ' . $obj->ID . ' AND "' . $parentField . '" = ' . $owner->ID);
 				}else {
 					DB::query('UPDATE "' . $table
-							. '" SET "' . $sortColumn . '" = ' . $sortColumn = ($max + $i)
+							. '" SET "' . $sortColumn . '" = ' . ($max + $i)
 							. ' WHERE "ID" = '. $obj->ID);
 				}
 				
@@ -436,4 +436,4 @@ class GridFieldSortableRows implements GridField_HTMLProvider, GridField_ActionP
 		}
 	}
 }
-?>
\ No newline at end of file
+?>