diff --git a/DuetPkg/PciBusNoEnumerationDxe/PciPowerManagement.h b/DuetPkg/PciBusNoEnumerationDxe/PciPowerManagement.h
index 9a44e7ecdb..e53303bbe5 100644
--- a/DuetPkg/PciBusNoEnumerationDxe/PciPowerManagement.h
+++ b/DuetPkg/PciBusNoEnumerationDxe/PciPowerManagement.h
@@ -25,6 +25,7 @@ Revision History
 #define _EFI_PCI_POWER_MANAGEMENT_H
 
 EFI_STATUS
+EFIAPI
 ResetPowerManagementFeature (
   IN PCI_IO_DEVICE *PciIoDevice
   )