diff --git a/src/index.ts b/src/index.ts
index 63291c0..89f013d 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -4,8 +4,8 @@ import { getInitialState } from './state';
 import { AsyncAdapterOptions } from './types';
 import { setSettings } from './settings';
 
-const createAsyncAdapter = (options: Partial<AsyncAdapterOptions>) => {
-  setSettings(options);
+const createAsyncAdapter = (options?: Partial<AsyncAdapterOptions>) => {
+  if (options) setSettings(options);
   return {
     ...reducers,
     getSelectors: () => selectors,
diff --git a/src/settings.ts b/src/settings.ts
index 9e2fc83..b63f029 100644
--- a/src/settings.ts
+++ b/src/settings.ts
@@ -9,6 +9,6 @@ export const getSettings = () => Object.freeze(settings);
 export const setSettings = (newSettings: Partial<AsyncAdapterOptions>) => {
   for (const property in newSettings) {
     const key = property as keyof AsyncAdapterOptions;
-    settings[key] = newSettings[key];
+    settings[key] = newSettings[key]!;
   }
 };