diff --git a/tty-term.c b/tty-term.c
index 9ad88597..f320db89 100644
--- a/tty-term.c
+++ b/tty-term.c
@@ -580,6 +580,9 @@ tty_term_create(struct tty *tty, char *name, int *feat, int fd, char **cause)
 	    (!tty_term_has(term, TTYC_SETRGBF) ||
 	    !tty_term_has(term, TTYC_SETRGBB)))
 		tty_add_features(feat, "RGB", ",");
+	if (tty_term_has(term, TTYC_SETRGBF) &&
+	    tty_term_has(term, TTYC_SETRGBB))
+		term->flags |= TERM_RGBCOLOURS;
 
 	/* Apply the features and overrides again. */
 	tty_apply_features(term, *feat);