diff --git a/src/include/device/device.h b/src/include/device/device.h
index 744836d..f3afd60 100644
--- a/src/include/device/device.h
+++ b/src/include/device/device.h
@@ -27,6 +27,7 @@
 struct smbus_bus_operations;
 struct pnp_mode_ops;
 struct spi_bus_operations;
+struct usb_bus_operations;
 
 /* Chip operations */
 struct chip_operations {
@@ -276,6 +277,7 @@
 void scan_generic_bus(struct device *bus);
 void scan_static_bus(struct device *bus);
 void scan_lpc_bus(struct device *bus);
+void scan_usb_bus(struct device *bus);
 
 #endif /* !defined(__ROMCC__) */