diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 137b25ce39a73e3a74ff43ecbdfab3ef1779ba9e..19993d89db378ec07cdb2dcf5e9532aaccb62219 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -640,7 +640,7 @@ static void uart_get_info(struct tty_port *port,
 {
 	struct uart_port *uport = state->uart_port;
 
-	memset(retinfo, 0, sizeof(retinfo));
+	memset(retinfo, 0, sizeof(*retinfo));
 
 	retinfo->type	    = uport->type;
 	retinfo->line	    = uport->line;