diff --git a/arch/i386/kernel/acpi/boot.c b/arch/i386/kernel/acpi/boot.c
index 447fa9e33ffb..2111529dea77 100644
--- a/arch/i386/kernel/acpi/boot.c
+++ b/arch/i386/kernel/acpi/boot.c
@@ -108,7 +108,7 @@ char *__acpi_map_table(unsigned long phys_addr, unsigned long size)
 	if (!phys_addr || !size)
 		return NULL;
 
-	if (phys_addr < (end_pfn_map << PAGE_SHIFT))
+	if (phys_addr+size <= (end_pfn_map << PAGE_SHIFT) + PAGE_SIZE)
 		return __va(phys_addr);
 
 	return NULL;