diff --git a/tty-term.c b/tty-term.c
index 9f0cac56..f81c93c0 100644
--- a/tty-term.c
+++ b/tty-term.c
@@ -494,8 +494,9 @@ tty_term_find(char *name, int fd, char **cause)
 		goto error;
 	}
 
-	/* Figure out if we have 256. */
-	if (tty_term_number(term, TTYC_COLORS) == 256)
+	/* Figure out if we have 256 colours (or more). */
+	if (tty_term_number(term, TTYC_COLORS) >= 256 ||
+	    tty_term_has(term, TTYC_RGB))
 		term->flags |= TERM_256COLOURS;
 
 	/*
diff --git a/tty.c b/tty.c
index a006fb27..e8ab4714 100644
--- a/tty.c
+++ b/tty.c
@@ -2000,8 +2000,7 @@ tty_colours_fg(struct tty *tty, const struct grid_cell *gc)
 	char			 s[32];
 
 	/* Is this a 24-bit or 256-colour colour? */
-	if (gc->fg & COLOUR_FLAG_RGB ||
-	    gc->fg & COLOUR_FLAG_256) {
+	if (gc->fg & COLOUR_FLAG_RGB || gc->fg & COLOUR_FLAG_256) {
 		if (tty_try_colour(tty, gc->fg, "38") == 0)
 			goto save_fg;
 		/* Should not get here, already converted in tty_check_fg. */
@@ -2030,8 +2029,7 @@ tty_colours_bg(struct tty *tty, const struct grid_cell *gc)
 	char			 s[32];
 
 	/* Is this a 24-bit or 256-colour colour? */
-	if (gc->bg & COLOUR_FLAG_RGB ||
-	    gc->bg & COLOUR_FLAG_256) {
+	if (gc->bg & COLOUR_FLAG_RGB || gc->bg & COLOUR_FLAG_256) {
 		if (tty_try_colour(tty, gc->bg, "48") == 0)
 			goto save_bg;
 		/* Should not get here, already converted in tty_check_bg. */