diff --git a/buffet/commands/schema_constants.cc b/buffet/commands/schema_constants.cc
index 3854278..cd06b32 100644
--- a/buffet/commands/schema_constants.cc
+++ b/buffet/commands/schema_constants.cc
@@ -43,6 +43,7 @@
 const char kOneOf_Metadata[] = "metadata";
 
 const char kObject_Properties[] = "properties";
+const char kObject_AdditionalProperties[] = "additionalProperties";
 
 const char kCommand_Id[] = "id";
 const char kCommand_Name[] = "name";