diff --git a/src/SIL.XForge.Scripture/Services/MachineProjectService.cs b/src/SIL.XForge.Scripture/Services/MachineProjectService.cs
index 1d6ba5b8c2..ac636f9db0 100644
--- a/src/SIL.XForge.Scripture/Services/MachineProjectService.cs
+++ b/src/SIL.XForge.Scripture/Services/MachineProjectService.cs
@@ -1028,7 +1028,7 @@ protected internal virtual async Task<string> GetTargetLanguageAsync(SFProject p
     {
         // Echo requires the target and source language to be the same, as it outputs your source texts
         bool useEcho = await featureManager.IsEnabledAsync(FeatureFlags.UseEchoForPreTranslation);
-        return useEcho ? GetSourceLanguage(project) : project.WritingSystem.Tag;
+        return useEcho ? GetSourceLanguage(project) : project.WritingSystem.Tag!;
     }
 
     /// <summary>