diff --git a/dom/media/MediaManager.cpp b/dom/media/MediaManager.cpp
index f005f46d1f61..63f44f44ad2d 100644
--- a/dom/media/MediaManager.cpp
+++ b/dom/media/MediaManager.cpp
@@ -3162,8 +3162,8 @@ RefPtr<MediaManager::StreamPromise> MediaManager::GetUserMedia(
           GetCurrentSerialEventTarget(), __func__,
           [self, windowID, c, windowListener, placeholderListener, hasAudio,
            hasVideo, askPermission, prefs, isSecure, isHandlingUserInput,
-           callID, principalInfo, aCallerType, resistFingerprinting,
-           audioType](RefPtr<LocalMediaDeviceSetRefCnt> aDevices) mutable {
+           callID, principalInfo, aCallerType, resistFingerprinting, audioType,
+           forceFakes](RefPtr<LocalMediaDeviceSetRefCnt> aDevices) mutable {
             LOG("GetUserMedia: starting post enumeration promise2 success "
                 "callback!");
 
@@ -3226,6 +3226,10 @@ RefPtr<MediaManager::StreamPromise> MediaManager::GetUserMedia(
             // It is time to ask for user permission, prime voice processing
             // now. Use a local lambda to enable a guard pattern.
             [&] {
+              if (forceFakes) {
+                return;
+              }
+
               if (audioType != MediaSourceEnum::Microphone) {
                 return;
               }