diff --git a/app/src/main/java/org/ntlab/irisclient/MemberRoomActivity.java b/app/src/main/java/org/ntlab/irisclient/MemberRoomActivity.java
index 03b494d..9cfcbc5 100644
--- a/app/src/main/java/org/ntlab/irisclient/MemberRoomActivity.java
+++ b/app/src/main/java/org/ntlab/irisclient/MemberRoomActivity.java
@@ -127,6 +127,7 @@
         redMasterButton.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
+                ((Iris) getApplication()).setMaster(true);
                 roomViewModel.changeBelongsAndMaster(roomId, myName,"r",true);
             }
         });
@@ -135,6 +136,7 @@
         redSpyButton.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
+                ((Iris) getApplication()).setMaster(false);
                 roomViewModel.changeBelongsAndMaster(roomId, myName,"r",false);
             }
         });
@@ -143,6 +145,7 @@
         blueMasterButton.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
+                ((Iris) getApplication()).setMaster(true);
                 roomViewModel.changeBelongsAndMaster(roomId, myName,"b",true);
             }
         });
@@ -151,6 +154,7 @@
         blueSpyButton.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
+                ((Iris) getApplication()).setMaster(false);
                 roomViewModel.changeBelongsAndMaster(roomId, myName,"b",false);
             }
         });