diff --git a/rdp-proxy/manager.py b/rdp-proxy/manager.py
index 48531a4..54f213b 100644
--- a/rdp-proxy/manager.py
+++ b/rdp-proxy/manager.py
@@ -94,6 +94,10 @@ def _anti_idle_loop():
                     env=env, capture_output=True, timeout=5,
                 )
                 toggle = not toggle
+                subprocess.run(
+                    ["xdotool", "key", "--window", win_id, "--clearmodifiers", "shift"],
+                    env=env, capture_output=True, timeout=5,
+                )
                 log.debug("anti_idle mousemove window=%s pos=%s,%s", win_id, x, y)
             else:
                 log.debug("anti_idle: xfreerdp window not found")