diff --git a/app/src/main/java/com/example/citrusclient/rest/FavoritesRest.java b/app/src/main/java/com/example/citrusclient/rest/FavoritesRest.java
index cffd5df..30b2273 100644
--- a/app/src/main/java/com/example/citrusclient/rest/FavoritesRest.java
+++ b/app/src/main/java/com/example/citrusclient/rest/FavoritesRest.java
@@ -3,7 +3,7 @@
 import com.example.citrusclient.models.Book;
 
 import java.util.HashMap;
-import java.util.HashSet;
+import java.util.List;
 
 import retrofit2.Call;
 import retrofit2.http.DELETE;
@@ -26,7 +26,7 @@
     //主{account_id}がいいねした誰か{other_account_id}の本の一覧
     @FormUrlEncoded
     @GET("accounts/{account_id}/favorites/{other_account_id}")
-    Call<HashSet<Integer>> getFavoritesBooksById(
+    Call<List<Integer>> getFavoritesBooksById(
             @Path("account_id") String accountId,
             @Path("other_account_id") String otherAccountId,
             @Query("token") String token
@@ -35,7 +35,7 @@
     //主{account_id}のある本{book_id}をいいねした人の一覧
     @FormUrlEncoded
     @GET("accounts/{account_id}/books/{book_id}/favorited")
-    Call<HashSet<String>> getFavoritedAccount(
+    Call<List<String>> getFavoritedAccount(
             @Path("account_id") String accountId,
             @Path("book_id") Integer bookId,
             @Query("token") String token