diff --git a/Dfe.PrepareConversions/Dfe.PrepareConversions/Startup.cs b/Dfe.PrepareConversions/Dfe.PrepareConversions/Startup.cs
index 15d9c186f..86192c1b6 100644
--- a/Dfe.PrepareConversions/Dfe.PrepareConversions/Startup.cs
+++ b/Dfe.PrepareConversions/Dfe.PrepareConversions/Startup.cs
@@ -86,7 +86,7 @@ public void ConfigureServices(IServiceCollection services)
 
       if (Directory.Exists(dpTargetPath)) {
          // If a Key Vault Key URI is defined, expect to encrypt the keys.xml
-         string? kvProtectionKeyUri = Configuration.GetValue<string>("DataProtection:KeyVaultKey");
+         string kvProtectionKeyUri = Configuration.GetValue<string>("DataProtection:KeyVaultKey");
 
          // Setup basic Data Protection and persist keys.xml to local file system
          var dp = services.AddDataProtection().PersistKeysToFileSystem(new DirectoryInfo(dpTargetPath));