diff --git a/arch/x86/core/intel64/locore.S b/arch/x86/core/intel64/locore.S
index ea6ae0bb24f..f1ae8ef9a8c 100644
--- a/arch/x86/core/intel64/locore.S
+++ b/arch/x86/core/intel64/locore.S
@@ -696,7 +696,7 @@ irq_dispatch:
 	wrmsr
 #else /* xAPIC */
 	movq z_loapic_regs, %rdx
-	movq %rax, LOAPIC_EOI(%rdx)
+	movl %eax, LOAPIC_EOI(%rdx)
 #endif /* CONFIG_X2APIC */
 
 	movq %gs:__x86_tss64_t_cpu_OFFSET, %rsi