diff --git a/config.go b/config.go
index 04f2a4e..3e88457 100644
--- a/config.go
+++ b/config.go
@@ -111,7 +111,7 @@ var defaultConfig = &Config{
 	ActiveExtension:      "",
 	KeyboardMacros:       []KeyboardMacro{},
 	DisplayRotation:      "270",
-	KeyboardLayout:       "en-US",
+	KeyboardLayout:       "en_US",
 	DisplayMaxBrightness: 64,
 	DisplayDimAfterSec:   120,  // 2 minutes
 	DisplayOffAfterSec:   1800, // 30 minutes
diff --git a/ui/src/components/popovers/PasteModal.tsx b/ui/src/components/popovers/PasteModal.tsx
index ed642a8..8103edd 100644
--- a/ui/src/components/popovers/PasteModal.tsx
+++ b/ui/src/components/popovers/PasteModal.tsx
@@ -39,11 +39,11 @@ export default function PasteModal() {
     state => state.setKeyboardLayout,
   );
 
-  // this ensures we always get the original en-US if it hasn't been set yet
+  // this ensures we always get the original en_US if it hasn't been set yet
   const safeKeyboardLayout = useMemo(() => {
     if (keyboardLayout && keyboardLayout.length > 0)
       return keyboardLayout;
-    return "en-US";
+    return "en_US";
   }, [keyboardLayout]);
 
   useEffect(() => {
diff --git a/ui/src/routes/devices.$id.settings.keyboard.tsx b/ui/src/routes/devices.$id.settings.keyboard.tsx
index 12ed6f2..6e68f81 100644
--- a/ui/src/routes/devices.$id.settings.keyboard.tsx
+++ b/ui/src/routes/devices.$id.settings.keyboard.tsx
@@ -25,11 +25,11 @@ export default function SettingsKeyboardRoute() {
     state => state.setShowPressedKeys,
   );
 
-  // this ensures we always get the original en-US if it hasn't been set yet
+  // this ensures we always get the original en_US if it hasn't been set yet
   const safeKeyboardLayout = useMemo(() => {
       if (keyboardLayout && keyboardLayout.length > 0)
         return keyboardLayout;
-      return "en-US";
+      return "en_US";
   }, [keyboardLayout]);
 
   const layoutOptions = Object.entries(layouts).map(([code, language]) => { return { value: code, label: language } })