diff --git a/reactos/ntoskrnl/ke/arm/boot.s b/reactos/ntoskrnl/ke/arm/boot.s
index eff065cacbc..5bce7356a16 100644
--- a/reactos/ntoskrnl/ke/arm/boot.s
+++ b/reactos/ntoskrnl/ke/arm/boot.s
@@ -15,7 +15,10 @@
     PROLOG_END KiSystemStartup
     
     /* Put us in FIQ mode, set IRQ stack */
-    msr cpsr_c, #CPSR_FIQ_MODE
+    b .
+    mrs r3, cpsr
+    orr r3, r1, #CPSR_FIQ_MODE
+    msr cpsr, r3
     ldr sp, [a1, #LpbInterruptStack]
     
     /* Repeat for IRQ mode */