diff --git a/src/NestedSetsBehavior.php b/src/NestedSetsBehavior.php
index 4dfee70..e21ff4f 100644
--- a/src/NestedSetsBehavior.php
+++ b/src/NestedSetsBehavior.php
@@ -174,7 +174,7 @@ public function afterDelete(): void
                 ],
                 $condition,
             );
-            $this->shiftLeftRightAttribute($rightValue + 1, -2);
+            $this->shiftLeftRightAttribute($rightValue, -2);
         }
 
         $this->operation = null;