diff --git a/src/xpra/server/window/window_video_source.py b/src/xpra/server/window/window_video_source.py
index 2d7b735dfb..02b5422eb1 100644
--- a/src/xpra/server/window/window_video_source.py
+++ b/src/xpra/server/window/window_video_source.py
@@ -1448,7 +1448,6 @@ def do_video_encode(self, encoding, image, options):
             Runs in the 'encode' thread.
         """
         x, y, w, h = image.get_geometry()[:4]
-        assert (x==0 and y==0) or self.video_subregion.rectangle, "invalid position: %s,%s" % (x,y)
         src_format = image.get_pixel_format()
         if self.pixel_format!=src_format:
             videolog.warn("image pixel format changed from %s to %s", self.pixel_format, src_format)