diff --git a/reactos/boot/freeldr/freeldr/include/reactos.h b/reactos/boot/freeldr/freeldr/include/reactos.h
index 0caf409bcc4..0b627bd5268 100644
--- a/reactos/boot/freeldr/freeldr/include/reactos.h
+++ b/reactos/boot/freeldr/freeldr/include/reactos.h
@@ -23,7 +23,7 @@
 /* Base Addres of Kernel in Physical Memory */
 #define KERNEL_BASE_PHYS 0x800000
 
-#if !defined(_M_AMD64)
+#if defined(_M_IX86)
 
 /* Bits to shift to convert a Virtual Address into an Offset in the Page Table */
 #define PFN_SHIFT 12