diff --git a/api4/channel.go b/api4/channel.go
index 920140311a..1dfafd394d 100644
--- a/api4/channel.go
+++ b/api4/channel.go
@@ -1182,7 +1182,7 @@ func addChannelMember(c *Context, w http.ResponseWriter, r *http.Request) {
 		}
 	}
 
-	cm, err := c.App.AddChannelMember(member.UserId, channel, c.App.Session.UserId, postRootId, c.App.Session.Id)
+	cm, err := c.App.AddChannelMember(member.UserId, channel, c.App.Session.UserId, postRootId)
 	if err != nil {
 		c.Err = err
 		return
diff --git a/app/channel.go b/app/channel.go
index 363f279295..928514182d 100644
--- a/app/channel.go
+++ b/app/channel.go
@@ -915,7 +915,7 @@ func (a *App) AddUserToChannel(user *model.User, channel *model.Channel) (*model
 	return newMember, nil
 }
 
-func (a *App) AddChannelMember(userId string, channel *model.Channel, userRequestorId string, postRootId string, currentSessionId string) (*model.ChannelMember, *model.AppError) {
+func (a *App) AddChannelMember(userId string, channel *model.Channel, userRequestorId string, postRootId string) (*model.ChannelMember, *model.AppError) {
 	if member, err := a.Srv.Store.Channel().GetMember(channel.Id, userId); err != nil {
 		if err.Id != store.MISSING_CHANNEL_MEMBER_ERROR {
 			return nil, err
@@ -970,10 +970,6 @@ func (a *App) AddChannelMember(userId string, channel *model.Channel, userReques
 		})
 	}
 
-	if userRequestor != nil {
-		a.MarkChannelsAsViewed([]string{channel.Id}, userRequestor.Id, currentSessionId)
-	}
-
 	return cm, nil
 }
 
diff --git a/app/channel_test.go b/app/channel_test.go
index 9d0809eebe..09073bd6b6 100644
--- a/app/channel_test.go
+++ b/app/channel_test.go
@@ -438,7 +438,7 @@ func TestAddChannelMemberNoUserRequestor(t *testing.T) {
 	channel := th.createChannel(th.BasicTeam, model.CHANNEL_OPEN)
 	userRequestorId := ""
 	postRootId := ""
-	if _, err := th.App.AddChannelMember(user.Id, channel, userRequestorId, postRootId, ""); err != nil {
+	if _, err := th.App.AddChannelMember(user.Id, channel, userRequestorId, postRootId); err != nil {
 		t.Fatal("Failed to add user to channel. Error: " + err.Message)
 	}
 
@@ -738,7 +738,7 @@ func TestGetChannelMembersTimezones(t *testing.T) {
 
 	userRequestorId := ""
 	postRootId := ""
-	if _, err := th.App.AddChannelMember(th.BasicUser2.Id, th.BasicChannel, userRequestorId, postRootId, ""); err != nil {
+	if _, err := th.App.AddChannelMember(th.BasicUser2.Id, th.BasicChannel, userRequestorId, postRootId); err != nil {
 		t.Fatal("Failed to add user to channel. Error: " + err.Message)
 	}
 
diff --git a/app/command_invite.go b/app/command_invite.go
index 5a9745ddfc..d2574aec03 100644
--- a/app/command_invite.go
+++ b/app/command_invite.go
@@ -141,7 +141,7 @@ func (me *InviteProvider) DoCommand(a *App, args *model.CommandArgs, message str
 		}
 	}
 
-	if _, err := a.AddChannelMember(userProfile.Id, channelToJoin, args.Session.UserId, "", args.Session.Id); err != nil {
+	if _, err := a.AddChannelMember(userProfile.Id, channelToJoin, args.Session.UserId, ""); err != nil {
 		return &model.CommandResponse{
 			Text:         args.T("api.command_invite.fail.app_error"),
 			ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL,
diff --git a/app/plugin_api.go b/app/plugin_api.go
index 40344cc48f..7c0cbcc48d 100644
--- a/app/plugin_api.go
+++ b/app/plugin_api.go
@@ -392,7 +392,7 @@ func (api *PluginAPI) AddChannelMember(channelId, userId string) (*model.Channel
 		return nil, err
 	}
 
-	return api.app.AddChannelMember(userId, channel, userRequestorId, postRootId, "")
+	return api.app.AddChannelMember(userId, channel, userRequestorId, postRootId)
 }
 
 func (api *PluginAPI) GetChannelMember(channelId, userId string) (*model.ChannelMember, *model.AppError) {
diff --git a/app/syncables.go b/app/syncables.go
index 50d7a4f977..39512782c8 100644
--- a/app/syncables.go
+++ b/app/syncables.go
@@ -55,7 +55,7 @@ func (a *App) CreateDefaultMemberships(since int64) error {
 			)
 		}
 
-		_, err = a.AddChannelMember(userChannel.UserID, channel, "", "", "")
+		_, err = a.AddChannelMember(userChannel.UserID, channel, "", "")
 		if err != nil {
 			return err
 		}
diff --git a/app/syncables_test.go b/app/syncables_test.go
index cca329d4e1..c493b45d0e 100644
--- a/app/syncables_test.go
+++ b/app/syncables_test.go
@@ -257,7 +257,7 @@ func TestCreateDefaultMemberships(t *testing.T) {
 	}
 
 	// Ensure members are in channel
-	_, err = th.App.AddChannelMember(scientist1.Id, experimentsChannel, "", "", "")
+	_, err = th.App.AddChannelMember(scientist1.Id, experimentsChannel, "", "")
 	if err != nil {
 		t.Errorf("unable to add user to channel: %s", err.Error())
 	}
@@ -267,7 +267,7 @@ func TestCreateDefaultMemberships(t *testing.T) {
 	if err != nil {
 		t.Errorf("unable to add user to team: %s", err.Error())
 	}
-	_, err = th.App.AddChannelMember(singer1.Id, experimentsChannel, "", "", "")
+	_, err = th.App.AddChannelMember(singer1.Id, experimentsChannel, "", "")
 	if err != nil {
 		t.Errorf("unable to add user to channel: %s", err.Error())
 	}
@@ -341,7 +341,7 @@ func TestDeleteGroupMemberships(t *testing.T) {
 		_, err = th.App.AddTeamMember(th.BasicTeam.Id, userID)
 		require.Nil(t, err)
 
-		_, err = th.App.AddChannelMember(userID, th.BasicChannel, "", "", "")
+		_, err = th.App.AddChannelMember(userID, th.BasicChannel, "", "")
 		require.Nil(t, err)
 	}