--- a/dom/media/MediaCache.cpp
+++ b/dom/media/MediaCache.cpp
@@ -2309,18 +2309,18 @@ MediaCacheStream::NotifyResume()
     "MediaCacheStream::NotifyResume",
     [ this, client = RefPtr<ChannelMediaResource>(mClient) ]() {
       AutoLock lock(mMediaCache->Monitor());
       if (mClosed) {
         return;
       }
       // Don't resume download if we are already at the end of the stream for
       // seek will fail and be wasted anyway.
-      if (mStreamLength < 0 || mChannelOffset < mStreamLength) {
-        int64_t offset = mSeekTarget != -1 ? mSeekTarget : mChannelOffset;
+      int64_t offset = mSeekTarget != -1 ? mSeekTarget : mChannelOffset;
+      if (mStreamLength < 0 || offset < mStreamLength) {
         mClient->CacheClientSeek(offset, false);
         // DownloadResumed() will be notified when a new channel is opened.
       }
       // The channel remains dead. If we want to read some other data in the
       // future, CacheClientSeek() will be called to reopen the channel.
     });
   OwnerThread()->Dispatch(r.forget());
 }