diff --git a/tty-keys.c b/tty-keys.c
index 41253d67..5a2b3817 100644
--- a/tty-keys.c
+++ b/tty-keys.c
@@ -1293,7 +1293,7 @@ tty_keys_extended_device_attributes(struct tty *tty, const char *buf,
 	else if (strncmp(tmp, "tmux ", 5) == 0)
 		tty_default_features(&c->term_features, "tmux", 0);
 	else if (strncmp(tmp, "XTerm(", 6) == 0)
-		tty_default_features(&c->term_features, "xterm", 0);
+		tty_default_features(&c->term_features, "XTerm", 0);
 	else if (strncmp(tmp, "mintty ", 7) == 0)
 		tty_default_features(&c->term_features, "mintty", 0);
 	log_debug("%s: received extended DA %.*s", c->name, (int)*size, buf);