diff --git a/criu/tty.c b/criu/tty.c
index ae23094b7..9a4520d53 100644
--- a/criu/tty.c
+++ b/criu/tty.c
@@ -259,7 +259,7 @@ static int pts_fd_get_index(int fd, const struct fd_parms *p)
 {
 	int index;
 	const struct fd_link *link = p->link;
-	char *pos = strrchr(link->name, '/');
+	const char *pos = strrchr(link->name, '/');
 
 	if (!pos || pos == (link->name + link->len - 1)) {
 		pr_err("Unexpected format on path %s\n", link->name + 1);