diff --git a/contiki-vsmile/ctk/ctk-arch.c b/contiki-vsmile/ctk/ctk-arch.c
index 4a8481b..ff60d17 100644
--- a/contiki-vsmile/ctk/ctk-arch.c
+++ b/contiki-vsmile/ctk/ctk-arch.c
@@ -87,6 +87,9 @@
 		   unsigned char reversed,
 		   unsigned char color)
 {
+	if (reversed)
+		color ^= 8;
+
 	vram[y * VRAM_WIDTH + x] = c;
 	if (x & 1) {
 		vram_attr[(y * VRAM_WIDTH + x) / 2] &= 0xff;