diff --git a/tests/unittests/unit/server/shadow_server_test.py b/tests/unittests/unit/server/shadow_server_test.py
index d3e8bbec89..a6baa5a5e9 100755
--- a/tests/unittests/unit/server/shadow_server_test.py
+++ b/tests/unittests/unit/server/shadow_server_test.py
@@ -92,7 +92,7 @@ def get_image(self, x, y, w, h):
 			def get_info(self):
 				return {"type" : "fake"}
 		window = FakeRootWindow()
-		rwm = RootWindowModel(window, FakeCapture())
+		rwm = RootWindowModel(window, FakeCapture(), geometry=window.get_geometry()[:4])
 		assert repr(rwm)
 		assert rwm.get_info()
 		rwm.get_default_window_icon(32)