diff --git a/src/auth/backchannel.ts b/src/auth/backchannel.ts
index 86384afee..108a28f95 100644
--- a/src/auth/backchannel.ts
+++ b/src/auth/backchannel.ts
@@ -88,8 +88,13 @@ export type AuthorizeOptions = {
     audience?: string;
     /**
      * Custom expiry time in seconds for this request.
+     * @deprecated Use {@link AuthorizeOptions.requested_expiry} instead.
      */
     request_expiry?: string;
+    /**
+     * Custom expiry time in seconds for this request.
+     */
+    requested_expiry?: string;
     /**
      * The user ID.
      */
@@ -191,6 +196,12 @@ export class Backchannel extends BaseAuthAPI implements IBackchannel {
             client_id: this.clientId,
         };
 
+        // The correct parameter is `requested_expiry`, but we also accept the deprecated `request_expiry` for backwards compatibility
+        const requestedExpiry = options.requested_expiry || options.request_expiry;
+        if (requestedExpiry) {
+            body.requested_expiry = requestedExpiry;
+        }
+
         await this.addClientAuthentication(body);
 
         const response = await this.request.bind(this)(
diff --git a/tests/auth/backchannel.test.ts b/tests/auth/backchannel.test.ts
index 9e6582db4..fd57e0c4b 100644
--- a/tests/auth/backchannel.test.ts
+++ b/tests/auth/backchannel.test.ts
@@ -90,6 +90,61 @@ describe("Backchannel", () => {
             });
         });
 
+        it("should pass requested_expiry to /bc-authorize", async () => {
+            let receivedRequestedExpiry = 0;
+            nock(`https://${opts.domain}`)
+                .post("/bc-authorize")
+                .reply(201, (uri, requestBody, cb) => {
+                    receivedRequestedExpiry = JSON.parse(
+                        querystring.parse(requestBody as any)["requested_expiry"] as string,
+                    );
+                    cb(null, {
+                        auth_req_id: "test-auth-req-id",
+                        expires_in: 300,
+                        interval: 5,
+                    });
+                });
+
+            await backchannel.authorize({
+                userId: "auth0|test-user-id",
+                binding_message: "Test binding message",
+                scope: "openid",
+                requested_expiry: "999",
+            });
+
+            expect(receivedRequestedExpiry).toBe(999);
+        });
+
+        it("should pass request_expiry as requested_expiry and retain the request_expiry param for backwards compatibility", async () => {
+            let receivedRequestedExpiry = 0;
+            let receivedRequestExpiry = 0;
+            nock(`https://${opts.domain}`)
+                .post("/bc-authorize")
+                .reply(201, (uri, requestBody, cb) => {
+                    receivedRequestedExpiry = JSON.parse(
+                        querystring.parse(requestBody as any)["requested_expiry"] as string,
+                    );
+                    receivedRequestExpiry = JSON.parse(
+                        querystring.parse(requestBody as any)["request_expiry"] as string,
+                    );
+                    cb(null, {
+                        auth_req_id: "test-auth-req-id",
+                        expires_in: 300,
+                        interval: 5,
+                    });
+                });
+
+            await backchannel.authorize({
+                userId: "auth0|test-user-id",
+                binding_message: "Test binding message",
+                scope: "openid",
+                request_expiry: "999",
+            });
+
+            expect(receivedRequestedExpiry).toBe(999);
+            expect(receivedRequestExpiry).toBe(999);
+        });
+
         it("should pass authorization_details to /bc-authorize", async () => {
             let receivedAuthorizationDetails: { type: string }[] = [];
             nock(`https://${opts.domain}`)