diff --git a/store/sqlstore/user_store.go b/store/sqlstore/user_store.go
index 8d9093e08f..ddc68cc0d0 100644
--- a/store/sqlstore/user_store.go
+++ b/store/sqlstore/user_store.go
@@ -2028,19 +2028,8 @@ func (us SqlUserStore) DemoteUserToGuest(userID string) (_ *model.User, err erro
 		return nil, err
 	}
 
-	roles := user.GetRoles()
-
-	newRoles := []string{}
-	for _, role := range roles {
-		if role == model.SystemUserRoleId {
-			newRoles = append(newRoles, model.SystemGuestRoleId)
-		} else if role != model.SystemAdminRoleId {
-			newRoles = append(newRoles, role)
-		}
-	}
-
 	curTime := model.GetMillis()
-	newRolesDBStr := strings.Join(newRoles, " ")
+	newRolesDBStr := model.SystemGuestRoleId
 	query := us.getQueryBuilder().Update("Users").
 		Set("Roles", newRolesDBStr).
 		Set("UpdateAt", curTime).
diff --git a/store/storetest/user_store.go b/store/storetest/user_store.go
index 138c3cfb14..566a145dca 100644
--- a/store/storetest/user_store.go
+++ b/store/storetest/user_store.go
@@ -5724,7 +5724,7 @@ func testUserStoreDemoteUserToGuest(t *testing.T, ss store.Store) {
 
 		updatedUser, err := ss.User().DemoteUserToGuest(user.Id)
 		require.NoError(t, err)
-		require.Equal(t, "system_guest custom_role", updatedUser.Roles)
+		require.Equal(t, "system_guest", updatedUser.Roles)
 
 		updatedTeamMember, nErr := ss.Team().GetMember(context.Background(), teamId, user.Id)
 		require.NoError(t, nErr)