diff --git a/src/interface/client.js b/src/interface/client.js
index 74738c06..b9f5a26f 100644
--- a/src/interface/client.js
+++ b/src/interface/client.js
@@ -48,7 +48,7 @@ export function request(options) {
             options.window = options.window.contentWindow;
         }
 
-        if (typeof options.window !== 'object' || options.window === null) { 
+        if (options.window === null) {
             throw new Error('Expected options.window to be a window object, iframe, or iframe element id.');
         }