diff --git a/lib/http-range.ts b/lib/http-range.ts
index 72199ab..bb8c64e 100644
--- a/lib/http-range.ts
+++ b/lib/http-range.ts
@@ -6,7 +6,7 @@ export type HttpByteRange = {
 export function parseHttpByteRange(range: string, size: number): HttpByteRange | null {
   if (!Number.isSafeInteger(size) || size <= 0) return null;
 
-  const match = /^bytes=(\d*)-(\d*)$/.exec(range.trim());
+  const match = /^bytes=(\d*)-(\d*)$/i.exec(range.trim());
   if (!match) return null;
 
   const [, startText, endText] = match;
diff --git a/tests/http-range.test.mjs b/tests/http-range.test.mjs
index f85e1ab..a1b6464 100644
--- a/tests/http-range.test.mjs
+++ b/tests/http-range.test.mjs
@@ -5,6 +5,7 @@ import { parseHttpByteRange } from "../lib/http-range.ts";
 
 test("HTTP range parser handles bounded and open-ended byte ranges", () => {
   assert.deepEqual(parseHttpByteRange("bytes=2-5", 10), { start: 2, end: 5 });
+  assert.deepEqual(parseHttpByteRange("BYTES=2-5", 10), { start: 2, end: 5 });
   assert.deepEqual(parseHttpByteRange("bytes=7-", 10), { start: 7, end: 9 });
   assert.deepEqual(parseHttpByteRange("bytes=2-99", 10), { start: 2, end: 9 });
 });