diff --git a/ICSharpCode.NRefactory/CSharp/Ast/Expressions/BinaryOperatorExpression.cs b/ICSharpCode.NRefactory/CSharp/Ast/Expressions/BinaryOperatorExpression.cs
index 98a7a033fb..fcaa9d36cd 100644
--- a/ICSharpCode.NRefactory/CSharp/Ast/Expressions/BinaryOperatorExpression.cs
+++ b/ICSharpCode.NRefactory/CSharp/Ast/Expressions/BinaryOperatorExpression.cs
@@ -167,6 +167,8 @@ namespace ICSharpCode.NRefactory.CSharp
 		ShiftRight,
 		
 		/// <summary>left ?? right</summary>
-		NullCoalescing
+		NullCoalescing,
+		
+		None
 	}
 }