diff --git a/xrdpvr/xrdpvr.c b/xrdpvr/xrdpvr.c
index a342a7e1..980a10d4 100644
--- a/xrdpvr/xrdpvr.c
+++ b/xrdpvr/xrdpvr.c
@@ -915,7 +915,7 @@ xrdpvr_write_to_client(void *channel, STREAM *s)
         rv = WTSVirtualChannelWrite(channel, &s->data[index], bytes_to_send,
                                     &bytes_written);
 
-        if (rv < 0)
+        if (rv == 0)
         {
             return -1;
         }