* triplet @char_per_block, @block_w, @block_h for better
                 * describing the pixel format.
                 */
-               u8 cpp[3];
+               u8 cpp[4];
 
                /**
                 * @char_per_block:
                 * information from their drm_mode_config.get_format_info hook
                 * if they want the core to be validating the pitch.
                 */
-               u8 char_per_block[3];
+               u8 char_per_block[4];
        };
 
        /**
         * Block width in pixels, this is intended to be accessed through
         * drm_format_info_block_width()
         */
-       u8 block_w[3];
+       u8 block_w[4];
 
        /**
         * @block_h:
         * Block height in pixels, this is intended to be accessed through
         * drm_format_info_block_height()
         */
-       u8 block_h[3];
+       u8 block_h[4];
 
        /** @hsub: Horizontal chroma subsampling factor */
        u8 hsub;