diff --git a/src/background/audio.ts b/src/background/audio.ts
index a34a59d..ac41d40 100644
--- a/src/background/audio.ts
+++ b/src/background/audio.ts
@@ -9,11 +9,11 @@ const portAudio = require('naudiodon');
 
 let ai: typeof portAudio.AudioIO | null = null;
 let ao: typeof portAudio.AudioIO | null = null;
-let audioInput: Buffer[] = [];
+const audioInput: Buffer[] = [];
 const audioContainer = {
     input: '',
 }
-let audio: Buffer | null = null;
+const audio: Buffer | null = null;
 const encoding = "base64";
 const audioOptions = {
     channelCount: 1,