diff --git a/Tusker/Screens/Main/MainSplitViewController.swift b/Tusker/Screens/Main/MainSplitViewController.swift
index 3bdd94e1..e30741ee 100644
--- a/Tusker/Screens/Main/MainSplitViewController.swift
+++ b/Tusker/Screens/Main/MainSplitViewController.swift
@@ -20,6 +20,14 @@ class MainSplitViewController: UISplitViewController {
     
     private var tabBarViewController: MainTabBarViewController!
     
+    override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
+        if UIDevice.current.userInterfaceIdiom == .phone {
+            return .portrait
+        } else {
+            return .all
+        }
+    }
+    
     init(mastodonController: MastodonController) {
         self.mastodonController = mastodonController