diff --git a/cfgrammar/src/lib/yacc/ast.rs b/cfgrammar/src/lib/yacc/ast.rs
index f8cb781f0..fd4cde57b 100644
--- a/cfgrammar/src/lib/yacc/ast.rs
+++ b/cfgrammar/src/lib/yacc/ast.rs
@@ -232,7 +232,7 @@ impl fmt::Display for Symbol {
 }
 
 impl GrammarAST {
-    pub fn new() -> GrammarAST {
+    pub(crate) fn new() -> GrammarAST {
         GrammarAST {
             start: None,
             rules: IndexMap::new(), // Using an IndexMap means that we retain the order