diff --git a/drivers/net/slip.c b/drivers/net/slip.c
index 65bd20fac8209fa7cf9d6e2973593d3a9fcaeace..3fd4735006f558f206135fb7a5546af0f3a8411f 100644
--- a/drivers/net/slip.c
+++ b/drivers/net/slip.c
@@ -957,7 +957,7 @@ slip_close(struct tty_struct *tty)
   *			STANDARD SLIP ENCAPSULATION		  	 *
   ************************************************************************/
 
-int
+static int
 slip_esc(unsigned char *s, unsigned char *d, int len)
 {
 	unsigned char *ptr = d;