1 files changed, 3 insertions, 0 deletions
diff --git a/st.c b/st.c
index b887ed5..4f015ed 100644
--- a/st.c
+++ b/st.c
@@ -1277,6 +1277,9 @@ tsetchar(Rune u, const Glyph *attr, int x, int y)
 	term.dirty[y] = 1;
 	term.line[y][x] = *attr;
 	term.line[y][x].u = u;
+
+	if (isboxdraw(u))
+		term.line[y][x].mode |= ATTR_BOXDRAW;
 }
 
 void