diff --git a/libcutils/include/private/android_filesystem_config.h b/libcutils/include/private/android_filesystem_config.h
index 2ecf5bce6..2f2e26238 100644
--- a/libcutils/include/private/android_filesystem_config.h
+++ b/libcutils/include/private/android_filesystem_config.h
@@ -122,6 +122,7 @@
 #define AID_AUTOMOTIVE_EVS 1062  /* Automotive rear and surround view system */
 #define AID_LOWPAN 1063          /* LoWPAN subsystem */
 #define AID_HSM 1064             /* hardware security module subsystem */
+#define AID_RESERVED_DISK 1065   /* GID that has access to reserved disk space */
 /* Changes to this file must be made in AOSP, *not* in internal branches. */
 
 #define AID_SHELL 2000 /* adb and debug shell user */