diff --git a/arch/arm/boot/dts/overlays/vc4-kms-v3d-pi5-overlay.dts b/arch/arm/boot/dts/overlays/vc4-kms-v3d-pi5-overlay.dts
index 3e976b18e2f1e3..94ab6eb1fbaf6c 100644
--- a/arch/arm/boot/dts/overlays/vc4-kms-v3d-pi5-overlay.dts
+++ b/arch/arm/boot/dts/overlays/vc4-kms-v3d-pi5-overlay.dts
@@ -3,7 +3,7 @@
 #include "cma-overlay.dts"
 
 &frag0 {
-	size = <((320-4)*1024*1024)>;
+	size = <(64*1024*1024)>;
 };
 
 / {