diff --git a/arch/sim/src/up_touchscreen.c b/arch/sim/src/up_touchscreen.c
index f89371cbfb..53e8e0d0de 100644
--- a/arch/sim/src/up_touchscreen.c
+++ b/arch/sim/src/up_touchscreen.c
@@ -55,6 +55,7 @@
 #include <nuttx/kmalloc.h>
 #include <nuttx/arch.h>
 #include <nuttx/fs/fs.h>
+#include <nuttx/nx/nx.h>
 
 #include <nuttx/input/touchscreen.h>