diff --git a/libc/kernel/uapi/linux/v4l2-controls.h b/libc/kernel/uapi/linux/v4l2-controls.h
index 9288710..85f3a8b 100644
--- a/libc/kernel/uapi/linux/v4l2-controls.h
+++ b/libc/kernel/uapi/linux/v4l2-controls.h
@@ -870,6 +870,7 @@
 #define V4L2_CID_TEST_PATTERN_GREENR (V4L2_CID_IMAGE_SOURCE_CLASS_BASE + 5)
 #define V4L2_CID_TEST_PATTERN_BLUE (V4L2_CID_IMAGE_SOURCE_CLASS_BASE + 6)
 #define V4L2_CID_TEST_PATTERN_GREENB (V4L2_CID_IMAGE_SOURCE_CLASS_BASE + 7)
+#define V4L2_CID_UNIT_CELL_SIZE (V4L2_CID_IMAGE_SOURCE_CLASS_BASE + 8)
 #define V4L2_CID_IMAGE_PROC_CLASS_BASE (V4L2_CTRL_CLASS_IMAGE_PROC | 0x900)
 #define V4L2_CID_IMAGE_PROC_CLASS (V4L2_CTRL_CLASS_IMAGE_PROC | 1)
 #define V4L2_CID_LINK_FREQ (V4L2_CID_IMAGE_PROC_CLASS_BASE + 1)