diff --git a/src/Core/Constants.cs b/src/Core/Constants.cs
index 6baa9227e1..9334f71b1a 100644
--- a/src/Core/Constants.cs
+++ b/src/Core/Constants.cs
@@ -171,6 +171,7 @@ public static class FeatureFlagKeys
     public const string WebPush = "web-push";
     public const string AndroidImportLoginsFlow = "import-logins-flow";
     public const string PM12276Breadcrumbing = "pm-12276-breadcrumbing-for-business-features";
+    public const string OpaqueKeyExchange = "opaque-key-exchange";
 
     public static List<string> GetAllKeys()
     {