diff --git a/include/zephyr/arch/x86/thread_stack.h b/include/zephyr/arch/x86/thread_stack.h
index 5808d8bd99a6b09..3599b62058bf9f3 100644
--- a/include/zephyr/arch/x86/thread_stack.h
+++ b/include/zephyr/arch/x86/thread_stack.h
@@ -83,7 +83,7 @@ struct z_x86_thread_stack_header {
 #define ARCH_KERNEL_STACK_OBJ_ALIGN	CONFIG_MMU_PAGE_SIZE
 #else
 #define ARCH_KERNEL_STACK_RESERVED	0
-#define ARCH_KERNEL_STACK_OBJ_ALIGN	ARCH_STACK_PTR_ALIGN
+#define ARCH_KERNEL_STACK_OBJ_ALIGN	Z_X86_STACK_BASE_ALIGN
 #endif
 
 #endif /* !_ASMLANGUAGE */