diff --git a/arch/arm/src/sam34/sam_userspace.c b/arch/arm/src/sam34/sam_userspace.c
index 72f1a814b28..7fd274be3ea 100644
--- a/arch/arm/src/sam34/sam_userspace.c
+++ b/arch/arm/src/sam34/sam_userspace.c
@@ -44,6 +44,7 @@
 
 #include <nuttx/userspace.h>
 
+#include "sam_mpuinit.h"
 #include "sam_userspace.h"
 
 #ifdef CONFIG_NUTTX_KERNEL