diff --git a/asterix-runtime/src/main/resources/adm.grammar b/asterix-runtime/src/main/resources/adm.grammar
index b9db2e7..b0ca26f 100644
--- a/asterix-runtime/src/main/resources/adm.grammar
+++ b/asterix-runtime/src/main/resources/adm.grammar
@@ -19,6 +19,8 @@
 DATETIME_CONS  = string(datetime)
 DURATION_CONS  = string(duration)
 STRING_CONS    = string(string)
+HEX_CONS       = string(hex)
+BASE64_CONS    = string(base64)
 POINT_CONS     = string(point)
 POINT3D_CONS   = string(point3d)
 LINE_CONS      = string(line)