diff --git a/src/backends/meta-idle-monitor.c b/src/backends/meta-idle-monitor.c
index 7d9d29355..4c4357af6 100644
--- a/src/backends/meta-idle-monitor.c
+++ b/src/backends/meta-idle-monitor.c
@@ -358,7 +358,7 @@ meta_idle_monitor_xsync_handle_xevent_all (XEvent *xevent)
 {
   int i;
 
-  if (!meta_is_wayland_compositor ())
+  if (meta_is_wayland_compositor ())
     return;
 
   for (i = 0; i <= device_id_max; i++)