diff --git a/arch/arm/src/armv8-m/arm_secure_irq.c b/arch/arm/src/armv8-m/arm_secure_irq.c
index bc88a3928c..376ec71f34 100644
--- a/arch/arm/src/armv8-m/arm_secure_irq.c
+++ b/arch/arm/src/armv8-m/arm_secure_irq.c
@@ -49,6 +49,8 @@
 
 void up_secure_irq(int irq, bool secure)
 {
+  uint32_t keymask = 0;
+  uint32_t keyval = 0;
   uint32_t regaddr;
   uint32_t regval;
   uint32_t regbit;
@@ -60,6 +62,8 @@ void up_secure_irq(int irq, bool secure)
       case NVIC_IRQ_BUSFAULT:
         regaddr = NVIC_AIRCR;
         regbit  = NVIC_AIRCR_BFHFNMINS;
+        keymask = NVIC_AIRCR_VECTKEY_MASK;
+        keyval  = NVIC_AIRCR_VECTKEY;
         break;
 
       case NVIC_IRQ_DBGMONITOR:
@@ -85,6 +89,7 @@ void up_secure_irq(int irq, bool secure)
       regval |= regbit;
     }
 
+  regval = (regval & ~keymask) | keyval;
   putreg32(regval, regaddr);
 }