diff --git a/include/uapi/linux/usb/raw_gadget.h b/include/uapi/linux/usb/raw_gadget.h
index 00cbded71061..ea375082b3ac 100644
--- a/include/uapi/linux/usb/raw_gadget.h
+++ b/include/uapi/linux/usb/raw_gadget.h
@@ -66,12 +66,12 @@ struct usb_raw_event {
 #define USB_RAW_IO_FLAGS_ZERO	0x0001
 #define USB_RAW_IO_FLAGS_MASK	0x0001
 
-static int usb_raw_io_flags_valid(__u16 flags)
+static inline int usb_raw_io_flags_valid(__u16 flags)
 {
 	return (flags & ~USB_RAW_IO_FLAGS_MASK) == 0;
 }
 
-static int usb_raw_io_flags_zero(__u16 flags)
+static inline int usb_raw_io_flags_zero(__u16 flags)
 {
 	return (flags & USB_RAW_IO_FLAGS_ZERO);
 }