diff --git a/src/libs/Anthropic/Extensions/StringExtensions.cs b/src/libs/Anthropic/Extensions/StringExtensions.cs
index ac7deb1..eaffff6 100755
--- a/src/libs/Anthropic/Extensions/StringExtensions.cs
+++ b/src/libs/Anthropic/Extensions/StringExtensions.cs
@@ -32,7 +32,7 @@ public static string AsAssistantMessage(this string content)
     /// <returns></returns>
     public static string AsPrompt(this string content)
     {
-        return $"\n\n${content.AsHumanMessage()}\n\nAssistant:";
+        return $"\n\n{content.AsHumanMessage()}\n\nAssistant:";
     }
     
     /// <summary>