diff --git a/src/main/java/org/ntlab/nemophila/models/accounts/Account.java b/src/main/java/org/ntlab/nemophila/models/accounts/Account.java
index 84cd138..f11cb80 100644
--- a/src/main/java/org/ntlab/nemophila/models/accounts/Account.java
+++ b/src/main/java/org/ntlab/nemophila/models/accounts/Account.java
@@ -86,8 +86,8 @@
     }
 
     //投稿削除
-    public void deletePost(Post post) {
-        posts.remove(post);
+    public void deletePost(String pid) {
+        posts.remove(pid);
     }
     //投稿数の取得
     public int getPostsCount() {