diff --git a/firmware/export/usb.h b/firmware/export/usb.h
index f1c2c64d23..fc96c67166 100644
--- a/firmware/export/usb.h
+++ b/firmware/export/usb.h
@@ -23,7 +23,7 @@
 
 void usb_init(void);
 void usb_start_monitoring(void);
-void usb_acknowledge(int id);
+void usb_acknowledge(long id);
 void usb_wait_for_disconnect(struct event_queue *q);
 int usb_wait_for_disconnect_w_tmo(struct event_queue *q, int ticks);
 bool usb_inserted(void); /* return the official value, what's been reported to the threads */
diff --git a/firmware/usb.c b/firmware/usb.c
index 7060ccfe23..b29344ecc3 100644
--- a/firmware/usb.c
+++ b/firmware/usb.c
@@ -345,7 +345,7 @@ static void usb_tick(void)
 #endif
 }
 
-void usb_acknowledge(int id)
+void usb_acknowledge(long id)
 {
     queue_post(&usb_queue, id, NULL);
 }
@@ -428,7 +428,7 @@ bool usb_inserted(void)
 #endif
 
 /* Dummy simulator functions */
-void usb_acknowledge(int id)
+void usb_acknowledge(long id)
 {
     id = id;
 }