diff --git a/arch/risc-v/src/nuttsbi/sbi_start.c b/arch/risc-v/src/nuttsbi/sbi_start.c
index 7bc9e0a530..8b7aeb2484 100644
--- a/arch/risc-v/src/nuttsbi/sbi_start.c
+++ b/arch/risc-v/src/nuttsbi/sbi_start.c
@@ -32,6 +32,12 @@
 
 #include "sbi_internal.h"
 
+/****************************************************************************
+ * Preprocecssor definitions
+ ****************************************************************************/
+
+#define NAPOT_OPENALL   (PMPCFG_A_NAPOT | PMPCFG_RWX_MASK)
+
 /****************************************************************************
  * Private Functions
  ****************************************************************************/
@@ -119,7 +125,7 @@ void sbi_start(void)
 
   /* Open everything for PMP */
 
-  riscv_append_pmp_region(PMPCFG_A_NAPOT | PMPCFG_RWX_MASK, 0, -1);
+  DEBUGASSERT(riscv_append_pmp_region(NAPOT_OPENALL, 0, 0) == 0);
 
   /* Then jump to the S-mode start function */