diff --git a/app/src/main/java/com/example/tampopo_client/viewmodels/FriendViewModel.java b/app/src/main/java/com/example/tampopo_client/viewmodels/FriendViewModel.java
index 9c4005c..91b8021 100644
--- a/app/src/main/java/com/example/tampopo_client/viewmodels/FriendViewModel.java
+++ b/app/src/main/java/com/example/tampopo_client/viewmodels/FriendViewModel.java
@@ -14,6 +14,7 @@
 import retrofit2.Response;
 import retrofit2.Retrofit;
 import retrofit2.converter.jackson.JacksonConverterFactory;
+import retrofit2.converter.scalars.ScalarsConverterFactory;
 import retrofit2.http.Field;
 
 public class FriendViewModel extends ViewModel {
@@ -27,6 +28,7 @@
     public FriendViewModel(){
         this.retrofit = new Retrofit.Builder()
                 .baseUrl("http://nitta-lab-www.is.konan-u.ac.jp/tampopo/")
+                .addConverterFactory(ScalarsConverterFactory.create())
                 .addConverterFactory(JacksonConverterFactory.create())
                 .build();
         this.usersResource = retrofit.create(UserResource.class);