diff --git a/src-tauri/src/lib.rs b/src-tauri/src/lib.rs
index 87944b3..d0b9753 100644
--- a/src-tauri/src/lib.rs
+++ b/src-tauri/src/lib.rs
@@ -1294,9 +1294,12 @@ pub fn run() {
 ///
 /// cinny-desktop #19: `LOTUS_WEBVIEW2_DEBUG_PORT=<port>` in the environment
 /// opens WebView2's DevTools port on localhost so the Windows smoke test can
-/// drive the installed app. WebView2's own `WEBVIEW2_ADDITIONAL_BROWSER_ARGUMENTS`
-/// doesn't apply because the app sets its arguments explicitly. Off unless the
-/// variable holds a valid port; only whoever launches the app can set it.
+/// drive the installed app, and gives it Chromium's fake capture devices (the
+/// CI VM has no microphone; permission requests still go through the app's
+/// real PermissionRequested handler). WebView2's own
+/// `WEBVIEW2_ADDITIONAL_BROWSER_ARGUMENTS` doesn't apply because the app sets
+/// its arguments explicitly. Off unless the variable holds a valid port; only
+/// whoever launches the app can set it.
 pub(crate) fn webview2_browser_args(debug_port: Option<&str>) -> String {
     let mut args = String::from(
         "--disable-features=msWebOOUI,msPdfOOUI --disable-background-timer-throttling --disable-renderer-backgrounding --disable-backgrounding-occluded-windows",
@@ -1306,7 +1309,9 @@ pub(crate) fn webview2_browser_args(debug_port: Option<&str>) -> String {
         .filter(|p| *p >= 1024)
     {
         eprintln!("webview: DevTools port {port} open (LOTUS_WEBVIEW2_DEBUG_PORT)");
-        args.push_str(&format!(" --remote-debugging-port={port}"));
+        args.push_str(&format!(
+            " --remote-debugging-port={port} --use-fake-device-for-media-stream"
+        ));
     }
     args
 }
@@ -1320,7 +1325,8 @@ mod webview2_args_tests {
         let base = webview2_browser_args(None);
         assert!(base.contains("--disable-renderer-backgrounding"));
         assert!(!base.contains("remote-debugging"));
-        assert!(webview2_browser_args(Some("9222")).ends_with(" --remote-debugging-port=9222"));
+        assert!(webview2_browser_args(Some("9222"))
+            .ends_with(" --remote-debugging-port=9222 --use-fake-device-for-media-stream"));
         for bad in ["", "abc", "80", "70000", "9222 --evil", "-1"] {
             assert_eq!(webview2_browser_args(Some(bad)), base, "{bad}");
         }