diff --git a/src/Spectre.Console/Prompts/TextPrompt.cs b/src/Spectre.Console/Prompts/TextPrompt.cs
index 0d9b501..9f253bf 100644
--- a/src/Spectre.Console/Prompts/TextPrompt.cs
+++ b/src/Spectre.Console/Prompts/TextPrompt.cs
@@ -85,7 +85,7 @@ public sealed class TextPrompt<T> : IPrompt<T>
     /// <param name="comparer">The comparer used for choices.</param>
     public TextPrompt(string prompt, StringComparer? comparer = null)
     {
-        _prompt = prompt;
+        _prompt = prompt ?? throw new System.ArgumentNullException(nameof(prompt));
         _comparer = comparer;
     }