diff --git a/portable/GCC/ARM_CA53_64_BIT/portASM.S b/portable/GCC/ARM_CA53_64_BIT/portASM.S
index 80cb574f0..47f7c7391 100644
--- a/portable/GCC/ARM_CA53_64_BIT/portASM.S
+++ b/portable/GCC/ARM_CA53_64_BIT/portASM.S
@@ -319,7 +319,7 @@ FreeRTOS_IRQ_Handler:
 	BL vApplicationIRQHandler
 
 	/* Disable interrupts. */
-	MSR 	DAIFSET, #2
+	MSR 	DAIFSET, #3
 	DSB		SY
 	ISB		SY