diff --git a/NewTerminalWindowController.m b/NewTerminalWindowController.m
index f6a66eb..f576ada 100644
--- a/NewTerminalWindowController.m
+++ b/NewTerminalWindowController.m
@@ -133,9 +133,9 @@ enum {
 {
     
     NSMenuItem *item = [_terminalTypeButton selectedItem];
-    unsigned tag = [item tag];
+    NSUInteger tag = [item tag];
     
-    Class klass = [EmulatorManager emulatorForTag: tag];
+    Class klass = [EmulatorManager emulatorForTag: (unsigned)tag];
     
     if (klass)
     {