diff --git a/src/ast/operator.rs b/src/ast/operator.rs
index 75877c949..14d91362c 100644
--- a/src/ast/operator.rs
+++ b/src/ast/operator.rs
@@ -85,6 +85,8 @@ pub enum BinaryOperator {
     BitwiseOr,
     BitwiseAnd,
     BitwiseXor,
+    /// Support for custom operators (built by parsers outside this crate)
+    Custom(String),
     PGBitwiseXor,
     PGBitwiseShiftLeft,
     PGBitwiseShiftRight,
@@ -122,6 +124,7 @@ impl fmt::Display for BinaryOperator {
             BinaryOperator::BitwiseOr => f.write_str("|"),
             BinaryOperator::BitwiseAnd => f.write_str("&"),
             BinaryOperator::BitwiseXor => f.write_str("^"),
+            BinaryOperator::Custom(s) => f.write_str(s),
             BinaryOperator::PGBitwiseXor => f.write_str("#"),
             BinaryOperator::PGBitwiseShiftLeft => f.write_str("<<"),
             BinaryOperator::PGBitwiseShiftRight => f.write_str(">>"),