diff --git a/uisimulator/x11/kernel.h b/uisimulator/x11/kernel.h
index 7d4f4f3912..0a3c261179 100644
--- a/uisimulator/x11/kernel.h
+++ b/uisimulator/x11/kernel.h
@@ -23,4 +23,3 @@
 
 void x11_sleep(int);
 
-#define yield() x11_sleep(5)