diff --git a/objects/Pci.mpy b/objects/Pci.mpy
index d6917b020..a7763139f 100644
--- a/objects/Pci.mpy
+++ b/objects/Pci.mpy
@@ -1,7 +1,7 @@
 from Device import FooPioDevice, DmaDevice
 
 simobj PciConfigData(FooPioDevice):
-    addr = 0xffffffffffffffff
+    addr = 0xffffffffffffffffL
     VendorID = Param.UInt16("Vendor ID")
     DeviceID = Param.UInt16("Device ID")
     Command = Param.UInt16(0, "Command")
@@ -47,4 +47,4 @@ simobj PciDevice(DmaDevice):
     pci_func = Param.Int("PCI function code")
     configdata = Param.PciConfigData(Super, "PCI Config data")
     configspace = Param.PciConfigAll(Super, "PCI Configspace")
-    addr = 0xffffffffffffffff
+    addr = 0xffffffffffffffffL