diff --git a/src/hb-common.h b/src/hb-common.h
index c8bfd8825..88f475579 100644
--- a/src/hb-common.h
+++ b/src/hb-common.h
@@ -292,16 +292,16 @@ typedef enum
   /*7.0*/ HB_SCRIPT_MAHAJANI			= HB_TAG ('M','a','h','j'),
   /*7.0*/ HB_SCRIPT_MANICHAEAN			= HB_TAG ('M','a','n','i'),
   /*7.0*/ HB_SCRIPT_MENDE_KIKAKUI		= HB_TAG ('M','e','n','d'),
-  /*7.0*/ HB_SCRIPT_MODI			= ???
+  /*7.0*/ HB_SCRIPT_MODI			= HB_TAG ('M','o','d','i'),
   /*7.0*/ HB_SCRIPT_MRO				= HB_TAG ('M','r','o','o'),
   /*7.0*/ HB_SCRIPT_NABATAEAN			= HB_TAG ('N','b','a','t'),
   /*7.0*/ HB_SCRIPT_OLD_NORTH_ARABIAN		= HB_TAG ('N','a','r','b'),
   /*7.0*/ HB_SCRIPT_OLD_PERMIC			= HB_TAG ('P','e','r','m'),
   /*7.0*/ HB_SCRIPT_PAHAWH_HMONG		= HB_TAG ('H','m','n','g'),
   /*7.0*/ HB_SCRIPT_PALMYRENE			= HB_TAG ('P','a','l','m'),
-  /*7.0*/ HB_SCRIPT_PAU_CIN_HAU			= ???
+  /*7.0*/ HB_SCRIPT_PAU_CIN_HAU			= HB_TAG ('P','a','u','c'),
   /*7.0*/ HB_SCRIPT_PSALTER_PAHLAVI		= HB_TAG ('P','h','l','p'),
-  /*7.0*/ HB_SCRIPT_SIDDHAM			= ???
+  /*7.0*/ HB_SCRIPT_SIDDHAM			= HB_TAG ('S','i','d','d'),
   /*7.0*/ HB_SCRIPT_TIRHUTA			= HB_TAG ('T','i','r','h'),
   /*7.0*/ HB_SCRIPT_WARANG_CITI			= HB_TAG ('W','a','r','a'),
 #endif