diff --git a/lib/index.d.ts b/lib/index.d.ts
index 855a58af..1c2bc3fe 100644
--- a/lib/index.d.ts
+++ b/lib/index.d.ts
@@ -5,9 +5,22 @@ export declare namespace SegmentAnalytics {
     context?: object;
   }
 
-  interface IntegrationsSettings {
-    // TODO remove `any`
-    [key: string]: any;
+  type IntegrationsSettings = IntegrationSettings | SegmentIOIntegrationSettings
+
+  interface IntegrationSettings {
+    [key: string]: unknown
+  }
+
+  // TODO: Long term, this should probably live in analytics.js-integrations
+  interface SegmentIOIntegrationSettings {
+    addBundledMetadata: boolean;
+    apiHost?: string;
+    apiKey?: string;
+    crossDomainIdServers?: string[];
+    deleteCrossDomainId?: boolean;
+    retryQueue: boolean;
+    saveCrossDomainIdInLocalStorage: boolean;
+    unbundledIntegrations: any[];
   }
 
   interface CookieOptions {