diff --git a/arch/x86/include/asm/realmode.h b/arch/x86/include/asm/realmode.h
index 9b4a5da..1bfc74d 100644
--- a/arch/x86/include/asm/realmode.h
+++ b/arch/x86/include/asm/realmode.h
@@ -24,6 +24,10 @@
 	u32	level3_ident_pgt;
 	u32	level3_kernel_pgt;
 #endif
+#ifdef CONFIG_ACPI_SLEEP
+	u32	wakeup_start;
+	u32	wakeup_header;
+#endif
 } __attribute__((__packed__));
 
 extern struct real_mode_header real_mode_header;