diff -pNaru5 a/pserial/perle-serial.c b/pserial/perle-serial.c
--- a/pserial/perle-serial.c	2023-01-29 04:15:33.238149934 -0500
+++ b/pserial/perle-serial.c	2023-01-29 04:17:17.041142672 -0500
@@ -3153,11 +3153,13 @@ static int ps_ioctl(struct tty_struct *t
 		return -ENOIOCTLCMD;
 	}
 	return 0;
 }
 
-#if (LINUX_VERSION_CODE >  0x20612)		// 2.6.18
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(6,1,0)
+static void ps_set_termios(struct tty_struct *tty, const struct ktermios *old_termios)
+#elif (LINUX_VERSION_CODE >  0x20612)		// 2.6.18
 static void ps_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
 #else
 static void ps_set_termios(struct tty_struct *tty, struct termios *old_termios)
 #endif
 {