diff --git a/media/webrtc/trunk/webrtc/modules/video_capture/windows/MediaType.cpp b/media/webrtc/trunk/webrtc/modules/video_capture/windows/MediaType.cpp
index 54fc2ab7b..f06709446 100644
--- a/media/webrtc/trunk/webrtc/modules/video_capture/windows/MediaType.cpp
+++ b/media/webrtc/trunk/webrtc/modules/video_capture/windows/MediaType.cpp
@@ -82,7 +82,10 @@ MediaType::Assign(const AM_MEDIA_TYPE* aMediaType)
   Clear();
 
   // Shallow copy.
-  memcpy(this, aMediaType, sizeof(AM_MEDIA_TYPE));
+  memcpy(static_cast<AM_MEDIA_TYPE*>(this), aMediaType, sizeof(AM_MEDIA_TYPE));
+
+  if (pUnk)
+    pUnk->AddRef();
 
   // Create deep copy of incoming data...
   if (cbFormat) {
@@ -92,9 +95,6 @@ MediaType::Assign(const AM_MEDIA_TYPE* aMediaType)
     memcpy(pbFormat, aMediaType->pbFormat, cbFormat);
   }
 
-  if (pUnk)
-    pUnk->AddRef();
-
   return S_OK;
 }