diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index da8f15a..003a653 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -550,7 +550,9 @@
 
 	validate_pat_support(c);
 
+#ifdef CONFIG_SMP
 	c->cpu_index = boot_cpu_id;
+#endif
 }
 
 void __init early_cpu_init(void)