diff --git a/drivers/staging/gpib/gpio/gpib_bitbang.c b/drivers/staging/gpib/gpio/gpib_bitbang.c
index a2d562cbd65b4..23550502e0127 100644
--- a/drivers/staging/gpib/gpio/gpib_bitbang.c
+++ b/drivers/staging/gpib/gpio/gpib_bitbang.c
@@ -315,7 +315,7 @@ struct bb_priv {
 	enum listener_function_state listener_state;
 };
 
-inline long usec_diff(struct timespec64 *a, struct timespec64 *b);
+static inline long usec_diff(struct timespec64 *a, struct timespec64 *b);
 static void bb_buffer_print(unsigned char *buffer, size_t length, int cmd, int eoi);
 static void set_data_lines(u8 byte);
 static u8 get_data_lines(void);
diff --git a/drivers/staging/gpib/lpvo_usb_gpib/lpvo_usb_gpib.c b/drivers/staging/gpib/lpvo_usb_gpib/lpvo_usb_gpib.c
index 5388ae1afbc61..200885e3ab820 100644
--- a/drivers/staging/gpib/lpvo_usb_gpib/lpvo_usb_gpib.c
+++ b/drivers/staging/gpib/lpvo_usb_gpib/lpvo_usb_gpib.c
@@ -210,7 +210,7 @@ static int skel_do_release(gpib_board_t *);
  *		 (unix time in sec and NANOsec)
  */
 
-inline int usec_diff(struct timespec64 *a, struct timespec64 *b)
+static inline int usec_diff(struct timespec64 *a, struct timespec64 *b)
 {
 	return ((a->tv_sec - b->tv_sec) * 1000000 +
 		(a->tv_nsec - b->tv_nsec) / 1000);