diff --git a/Sources/LLMChatOpenAI/LLMChatOpenAI.swift b/Sources/LLMChatOpenAI/LLMChatOpenAI.swift
index 815e5cc..fa9479f 100644
--- a/Sources/LLMChatOpenAI/LLMChatOpenAI.swift
+++ b/Sources/LLMChatOpenAI/LLMChatOpenAI.swift
@@ -31,7 +31,7 @@ public struct LLMChatOpenAI {
         self.headers = headers
     }
     
-    var allHeaders: [String: String] {
+    private var allHeaders: [String: String] {
         var defaultHeaders = [
             "Content-Type": "application/json",
             "Authorization": "Bearer \(apiKey)"