diff --git a/compiler/cpp/src/parse/t_field.h b/compiler/cpp/src/parse/t_field.h
index 0c3c2b1..ac10d57 100644
--- a/compiler/cpp/src/parse/t_field.h
+++ b/compiler/cpp/src/parse/t_field.h
@@ -150,4 +150,13 @@
 
 };
 
+/**
+ * A simple struct for the parser to use to store a field ID, and whether or
+ * not it was specified by the user or automatically chosen.
+ */
+struct t_field_id {
+  int64_t value;
+  bool auto_assigned;
+};
+
 #endif