diff --git a/drivers/usb/gadget/f_obex.c b/drivers/usb/gadget/f_obex.c
index ad39f1dacba3..aebae1853bce 100644
--- a/drivers/usb/gadget/f_obex.c
+++ b/drivers/usb/gadget/f_obex.c
@@ -499,7 +499,7 @@ static void obex_unbind(struct usb_configuration *c, struct usb_function *f)
 	usb_free_all_descriptors(f);
 }
 
-struct usb_function *obex_alloc(struct usb_function_instance *fi)
+static struct usb_function *obex_alloc(struct usb_function_instance *fi)
 {
 	struct f_obex	*obex;
 	struct f_serial_opts *opts;