diff --git a/buffet/commands/schema_constants.h b/buffet/commands/schema_constants.h
index 9740303..fbbb3e3 100644
--- a/buffet/commands/schema_constants.h
+++ b/buffet/commands/schema_constants.h
@@ -56,6 +56,8 @@
 extern const char kCommand_Results[];
 extern const char kCommand_State[];
 extern const char kCommand_Progress[];
+extern const char kCommand_ErrorCode[];
+extern const char kCommand_ErrorMessage[];
 
 extern const char kCommand_Visibility[];
 extern const char kCommand_Visibility_None[];