diff --git a/src/mainboard/lenovo/x220/devicetree.cb b/src/mainboard/lenovo/x220/devicetree.cb
index 667b280f0c..3f1934d8e9 100644
--- a/src/mainboard/lenovo/x220/devicetree.cb
+++ b/src/mainboard/lenovo/x220/devicetree.cb
@@ -27,7 +27,7 @@ chip northbridge/intel/sandybridge
 		end
 	end
 
-	register "pci_mmio_size" = "1024"
+	register "pci_mmio_size" = "2048"
 
 	device domain 0 on
 		subsystemid 0x17aa 0x21db inherit