diff --git a/lib/driver.js b/lib/driver.js
index 512c3d0..66a7f6fb 100644
--- a/lib/driver.js
+++ b/lib/driver.js
@@ -126,8 +126,7 @@ export class Mac2Driver extends BaseDriver {
           log.info(`Prerun script output: ${output}`);
         }
       }
-      await this.wda.startSession({
-        ...caps,
+      await this.wda.startSession(caps, {
         reqBasePath: this.basePath,
       });
     } catch (e) {
diff --git a/lib/wda-mac.js b/lib/wda-mac.js
index 2dd804c..10ea28c 100644
--- a/lib/wda-mac.js
+++ b/lib/wda-mac.js
@@ -374,8 +374,9 @@ export class WDAMacServer {
   /**
    *
    * @param {import('@appium/types').StringRecord} caps
+   * @param {SessionOptions} [opts={}]
    */
-  async startSession (caps) {
+  async startSession (caps, opts = {}) {
     this.serverStartupTimeoutMs = caps.serverStartupTimeout ?? this.serverStartupTimeoutMs;
 
     this.isProxyingToRemoteServer = !!caps.webDriverAgentMacUrl;
@@ -406,7 +407,7 @@ export class WDAMacServer {
         keepAlive: true,
       };
       if (caps.reqBasePath) {
-        proxyOpts.reqBasePath = caps.reqBasePath;
+        proxyOpts.reqBasePath = opts.reqBasePath;
       }
       this.proxy = new WDAMacProxy(proxyOpts);
       this.proxy.didProcessExit = false;
@@ -480,3 +481,8 @@ export class WDAMacServer {
 const WDA_MAC_SERVER = new WDAMacServer();
 
 export default WDA_MAC_SERVER;
+
+/**
+ * @typedef {Object} SessionOptions
+ * @property {string} [reqBasePath]
+ */
\ No newline at end of file