diff --git a/arch/sim/src/sim/up_lcd.c b/arch/sim/src/sim/up_lcd.c
index 3ec52042e4..4cf7890546 100644
--- a/arch/sim/src/sim/up_lcd.c
+++ b/arch/sim/src/sim/up_lcd.c
@@ -37,6 +37,9 @@
 #include <nuttx/lcd/lcd.h>
 #include "up_internal.h"
 
+#if defined(CONFIG_SIM_X11FB)
+#include <nuttx/wqueue.h>
+#endif
 /****************************************************************************
  * Pre-processor Definitions
  ****************************************************************************/