diff --git a/arch/sim/src/sim/win/sim_hostmemory.c b/arch/sim/src/sim/win/sim_hostmemory.c
index 3eaafa0006..98844efdab 100644
--- a/arch/sim/src/sim/win/sim_hostmemory.c
+++ b/arch/sim/src/sim/win/sim_hostmemory.c
@@ -24,6 +24,8 @@
 
 #include <windows.h>
 
+#include "sim_internal.h"
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/