diff --git a/src/Core/Constants.cs b/src/Core/Constants.cs
index e41cf62024..a025bbb142 100644
--- a/src/Core/Constants.cs
+++ b/src/Core/Constants.cs
@@ -174,6 +174,7 @@ public static class FeatureFlagKeys
     public const string EnablePMAuthenticatorSync = "enable-pm-bwa-sync";
     public const string P15179_AddExistingOrgsFromProviderPortal = "pm-15179-add-existing-orgs-from-provider-portal";
     public const string AndroidMutualTls = "mutual-tls";
+    public const string PM3503_MobileAnonAddySelfHostAlias = "anon-addy-self-host-alias";
 
     public static List<string> GetAllKeys()
     {