diff --git a/backend/app/Http/Controllers/Api/ChildrenController.php b/backend/app/Http/Controllers/Api/ChildrenController.php
index 7614a5a5..96699310 100644
--- a/backend/app/Http/Controllers/Api/ChildrenController.php
+++ b/backend/app/Http/Controllers/Api/ChildrenController.php
@@ -472,9 +472,11 @@ https://kikikan.jp/c-account/forgot-password/reset/'.$token;
         }
 
         if (isset($r->token)) {
-            if (null === (TelActivation::select('id')->where('token', $r->token)->first())) {
+            if (null === ($ta = TelActivation::select('child_id')->where('token', $r->token)->first())) {
                 return ['status_code' => 400, 'error_messages' => ['パスワードの更新に失敗しました。']];
             }
+
+            $child_id = $ta->child_id;
         }
 
         // バリデーションエラー