diff --git a/src/protocol/ast_printer.rs b/src/protocol/ast_printer.rs
index ba45acba976625fff9d116b837774d4cd276901e..6bdc0dd1171d61344c781fe57b0ee3e296f35098 100644
--- a/src/protocol/ast_printer.rs
+++ b/src/protocol/ast_printer.rs
@@ -649,7 +649,15 @@ impl ASTWriter {
                 self.kv(indent2).with_s_key("Subject");
                 self.write_expr(heap, expr.subject, indent3);
 
-                self.kv(indent2).with_s_key("Field").with_identifier_val(&expr.field_name);
+                match &expr.kind {
+                    SelectKind::StructField(field_name) => {
+                        self.kv(indent2).with_s_key("StructField").with_identifier_val(field_name);
+                    },
+                    SelectKind::TupleMember(member_index) => {
+                        self.kv(indent2).with_s_key("TupleMember").with_disp_val(member_index);
+                    },
+                }
+
                 self.kv(indent2).with_s_key("Parent")
                     .with_custom_val(|v| write_expression_parent(v, &expr.parent));
             },