--- a/gfx/layers/client/TextureClient.cpp
+++ b/gfx/layers/client/TextureClient.cpp
@@ -1814,17 +1814,17 @@ TextureClient::CreateWithData(TextureDat
 
 bool
 MappedYCbCrChannelData::CopyInto(MappedYCbCrChannelData& aDst)
 {
   if (!data || !aDst.data || size != aDst.size) {
     return false;
   }
 
-  if (stride == aDst.stride) {
+  if (stride == aDst.stride && skip == aDst.skip) {
     // fast path!
     // We assume that the padding in the destination is there for alignment
     // purposes and doesn't contain useful data.
     memcpy(aDst.data, data, stride * size.height);
     return true;
   }
 
   for (int32_t i = 0; i < size.height; ++i) {