diff --git a/OpenRA.Game/Traits/LintAttributes.cs b/OpenRA.Game/Traits/LintAttributes.cs
index c6d2c1f210..8614ae8415 100644
--- a/OpenRA.Game/Traits/LintAttributes.cs
+++ b/OpenRA.Game/Traits/LintAttributes.cs
@@ -13,6 +13,7 @@ using System;
 
 namespace OpenRA.Traits
 {
+	[Flags]
 	public enum LintDictionaryReference
 	{
 		None = 0,