diff --git a/src/handlers/ortc/utils.ts b/src/handlers/ortc/utils.ts
index 33c98c67..0521ed14 100644
--- a/src/handlers/ortc/utils.ts
+++ b/src/handlers/ortc/utils.ts
@@ -75,7 +75,12 @@ export function applyForcedRtpExtensions(
 			const uri = extenCap.uri as RtpHeaderExtensionUri;
 			const enabled: boolean | undefined = forcedRtpExtensions[uri];
 
-			if (enabled === true) {
+			// MID is mandatory when BUNDLE is used and cannot be disabled by this API.
+			// Some browsers may report it as stopped after negotiation, but reject the
+			// entire list if that direction is submitted again.
+			if (uri === 'urn:ietf:params:rtp-hdrext:sdes:mid') {
+				extenCap.direction = 'sendrecv';
+			} else if (enabled === true) {
 				extenCap.direction = 'sendrecv';
 			} else if (enabled === false) {
 				extenCap.direction = 'stopped';
diff --git a/src/test/test.ts b/src/test/test.ts
index 6b508dee..94b57656 100644
--- a/src/test/test.ts
+++ b/src/test/test.ts
@@ -7,6 +7,7 @@ import { FakeMediaStreamTrack } from 'fake-mediastreamtrack';
 import * as mediasoupClient from '../index';
 import { UnsupportedError, InvalidStateError } from '../errors';
 import * as utils from '../utils';
+import { applyForcedRtpExtensions } from '../handlers/ortc/utils';
 import type { RtpCapabilities } from '../RtpParameters';
 import { FakeHandler } from '../handlers/FakeHandler';
 import * as fakeParameters from './fakeParameters';
@@ -1762,3 +1763,40 @@ describe('detectDevice() and detectDeviceAsync() assign proper handler based on
 		);
 	}
 });
+
+describe('applyForcedRtpExtensions()', () => {
+	test('keeps the mandatory MID extension enabled when forcing another extension', () => {
+		const midUri = 'urn:ietf:params:rtp-hdrext:sdes:mid';
+		const absCaptureTimeUri =
+			'http://www.webrtc.org/experiments/rtp-hdrext/abs-capture-time';
+		const capabilities: RTCRtpHeaderExtensionCapability[] = [
+			{ uri: midUri, direction: 'stopped' },
+			{ uri: absCaptureTimeUri, direction: 'recvonly' },
+		];
+		let submittedCapabilities: RTCRtpHeaderExtensionCapability[] | undefined;
+		const transceiver = {
+			getHeaderExtensionsToNegotiate: () => capabilities,
+			setHeaderExtensionsToNegotiate: (
+				nextCapabilities: RTCRtpHeaderExtensionCapability[]
+			) => {
+				const midExtension = nextCapabilities.find(({ uri }) => uri === midUri);
+
+				if (midExtension?.direction !== 'sendrecv') {
+					throw new Error('Attempted to stop a mandatory extension.');
+				}
+
+				submittedCapabilities = nextCapabilities;
+			},
+		} as unknown as RTCRtpTransceiver;
+
+		expect(
+			applyForcedRtpExtensions(transceiver, {
+				[absCaptureTimeUri]: true,
+			})
+		).toBe(true);
+		expect(submittedCapabilities).toEqual([
+			{ uri: midUri, direction: 'sendrecv' },
+			{ uri: absCaptureTimeUri, direction: 'sendrecv' },
+		]);
+	});
+});