diff --git a/app/audio-player/background.js b/app/audio-player/background.js
index 7633c3f..6e5be96 100644
--- a/app/audio-player/background.js
+++ b/app/audio-player/background.js
@@ -14,7 +14,7 @@ async function tryUntilItWorks(func, delayBetweenTries = 1, maxTries = 10) {
 
 async function onHeadersReceived({ responseHeaders, url, tabId }) {
 	const isAudio = responseHeaders.some(header =>
-		header.name === 'Content-Type' && header.value.startsWith('audio/')
+		header.name.toLowerCase() === 'content-type' && header.value.toLowerCase().startsWith('audio/')
 	);
 
 	if (isAudio) {