diff --git a/src/parser.c b/src/parser.c
index 345f8db..c59697d 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -175,7 +175,7 @@ static void parse_datatype_constructor(struct parser *p, struct constructor_list
 static struct decl *parse_datatype_decl(struct parser *p) {
     struct var_list *params = parse_def_var_list(p);
     if (cur_tok(p) != tok_ident) {
-        report_error(p, "Invalid datatype name, expected an identifier.\n");
+        report_error(p, "Invalid datatype name `%s`, expected an identifier.\n", token_descr(cur_tok(p)));
     }
     char *datatype_name = cur_lexeme(p);
     consume(p);