diff --git a/content/media/webrtc/MediaEngineWebRTC.cpp b/content/media/webrtc/MediaEngineWebRTC.cpp
index 421c6417079..3e09793d78e 100644
--- a/content/media/webrtc/MediaEngineWebRTC.cpp
+++ b/content/media/webrtc/MediaEngineWebRTC.cpp
@@ -112,7 +112,7 @@ MediaEngineWebRTC::EnumerateVideoDevices(dom::MediaSourceEnum aMediaSource,
       // We've already seen this device, just append.
       aVSources->AppendElement(vSource.get());
     } else {
-      vSource = new MediaEngineWebRTCVideoSource(i, mediaSourceType);
+      vSource = new MediaEngineWebRTCVideoSource(i, aMediaSource);
       mVideoSources.Put(uuid, vSource); // Hashtable takes ownership.
       aVSources->AppendElement(vSource);
     }