diff --git a/wuttapos/controls/header.py b/wuttapos/controls/header.py
index 545fa34..d551dc6 100644
--- a/wuttapos/controls/header.py
+++ b/wuttapos/controls/header.py
@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  WuttaPOS -- Pythonic Point of Sale System
-#  Copyright © 2023 Lance Edgar
+#  Copyright © 2023-2024 Lance Edgar
 #
 #  This file is part of WuttaPOS.
 #
@@ -37,7 +37,7 @@ from .feedback import WuttaFeedback
 class WuttaHeader(WuttaControl):
 
     def __init__(self, *args, **kwargs):
-        self.term_display = kwargs.pop('term_display', '??')
+        self.terminal_id = kwargs.pop('terminal_id', None)
         super().__init__(*args, **kwargs)
 
     def build(self):
@@ -51,6 +51,11 @@ class WuttaHeader(WuttaControl):
         self.logout_divider = ft.VerticalDivider(visible=False)
         self.title_button = ft.FilledButton(self.app.get_title(), on_click=self.title_click)
 
+        terminal_style = ft.TextStyle(size=20, weight=ft.FontWeight.BOLD)
+        if not self.terminal_id:
+            terminal_style.bgcolor = 'red'
+            terminal_style.color = 'white'
+
         return ft.Stack(
             controls=[
                 ft.Container(
@@ -81,7 +86,11 @@ class WuttaHeader(WuttaControl):
                                 ft.VerticalDivider(),
                                 self.logout_button,
                                 self.logout_divider,
-                                ft.Text(f"Term: {self.term_display}", weight=ft.FontWeight.BOLD, size=20),
+                                ft.Text(
+                                    spans=[
+                                        ft.TextSpan(style=terminal_style, text=f"Term: {self.terminal_id or '??'}"),
+                                    ],
+                                ),
                                 ft.VerticalDivider(),
                                 self.title_button,
                             ],
diff --git a/wuttapos/views/base.py b/wuttapos/views/base.py
index b863c9b..d8a1f21 100644
--- a/wuttapos/views/base.py
+++ b/wuttapos/views/base.py
@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  WuttaPOS -- Pythonic Point of Sale System
-#  Copyright © 2023 Lance Edgar
+#  Copyright © 2023-2024 Lance Edgar
 #
 #  This file is part of WuttaPOS.
 #
@@ -60,7 +60,7 @@ class WuttaView(ft.View):
     def build_header(self):
         handler = self.get_batch_handler()
         self.header = WuttaHeader(self.config, on_reset=self.reset,
-                                  term_display=handler.get_terminal_id() or '??')
+                                  terminal_id=handler.get_terminal_id())
         return self.header
 
     def get_batch_handler(self):