diff --git a/firmware/usb_performance/usb.h b/firmware/usb_performance/usb.h
index 2f2104c5..7b9c9390 100644
--- a/firmware/usb_performance/usb.h
+++ b/firmware/usb_performance/usb.h
@@ -31,6 +31,11 @@
 #define ATTR_ALIGNED(x)	__attribute__ ((aligned(x)))
 #define ATTR_SECTION(x) __attribute__ ((section(x)))
 
+extern bool usb_set_configuration(
+	usb_device_t* const device,
+	const uint_fast8_t configuration_number
+);
+
 void usb_peripheral_reset();
 
 void usb_device_init(