diff --git a/dlls/shcore/main.c b/dlls/shcore/main.c
index a64b6661d23..58ddda3fb2a 100644
--- a/dlls/shcore/main.c
+++ b/dlls/shcore/main.c
@@ -1017,7 +1017,7 @@ static HRESULT WINAPI filestream_CopyTo(IStream *iface, IStream *dest, ULARGE_IN
 
         /* Write */
         hr = IStream_Write(dest, buff, read_chunk, &written_chunk);
-        if (written_chunk)
+        if (written)
             written->QuadPart += written_chunk;
         if (FAILED(hr) || written_chunk != left)
             break;