diff --git a/arch/arm/boot/dts/stm32f746-disco.dts b/arch/arm/boot/dts/stm32f746-disco.dts
index cda423b6a874..36612b4c2504 100644
--- a/arch/arm/boot/dts/stm32f746-disco.dts
+++ b/arch/arm/boot/dts/stm32f746-disco.dts
@@ -142,6 +142,7 @@ &ltdc {
 	pinctrl-0 = <&ltdc_pins_a>;
 	pinctrl-names = "default";
 	status = "okay";
+	st,fb-bpp = <8>;
 
 	port {
 		ltdc_out_rgb: endpoint {