diff --git a/sdk/include/psdk/dsrole.h b/sdk/include/psdk/dsrole.h
index 75f2756213e..0e3ef252159 100644
--- a/sdk/include/psdk/dsrole.h
+++ b/sdk/include/psdk/dsrole.h
@@ -24,6 +24,7 @@
 #define DSROLE_PRIMARY_DS_RUNNING           0x00000001
 #define DSROLE_PRIMARY_DS_MIXED_MODE        0x00000002
 #define DSROLE_UPGRADE_IN_PROGRESS          0x00000004
+#define DSROLE_PRIMARY_DS_READONLY          0x00000008
 #define DSROLE_PRIMARY_DOMAIN_GUID_PRESENT  0x01000000
 
 typedef enum _DSROLE_PRIMARY_DOMAIN_INFO_LEVEL