diff --git a/drivers/usb/gadget/function/f_midi.c b/drivers/usb/gadget/function/f_midi.c
index 1f94dad57307..a90440300735 100644
--- a/drivers/usb/gadget/function/f_midi.c
+++ b/drivers/usb/gadget/function/f_midi.c
@@ -1097,7 +1097,7 @@ static void f_midi_unbind(struct usb_configuration *c, struct usb_function *f)
 	usb_free_all_descriptors(f);
 }
 
-struct usb_function *f_midi_alloc(struct usb_function_instance *fi)
+static struct usb_function *f_midi_alloc(struct usb_function_instance *fi)
 {
 	struct f_midi *midi;
 	struct f_midi_opts *opts;
diff --git a/drivers/usb/gadget/legacy/gmidi.c b/drivers/usb/gadget/legacy/gmidi.c
index 0d01e467af09..e02a095294ac 100644
--- a/drivers/usb/gadget/legacy/gmidi.c
+++ b/drivers/usb/gadget/legacy/gmidi.c
@@ -115,8 +115,8 @@ static struct usb_gadget_strings *dev_strings[] = {
 	NULL,
 };
 
-struct usb_function_instance *fi_midi;
-struct usb_function *f_midi;
+static struct usb_function_instance *fi_midi;
+static struct usb_function *f_midi;
 
 static int __exit midi_unbind(struct usb_composite_dev *dev)
 {