diff --git a/types/expo/expo-tests.tsx b/types/expo/expo-tests.tsx
index 57e028e8bf..481c1b27c4 100644
--- a/types/expo/expo-tests.tsx
+++ b/types/expo/expo-tests.tsx
@@ -47,6 +47,7 @@ import {
     Region,
     registerRootComponent,
     ScreenOrientation,
+    SecureStore,
     Svg,
     Updates
 } from 'expo';
@@ -484,6 +485,30 @@ async () => {
     isString(queryParams2['y'] || '');
 };
 
+// #region securestore
+async () => {
+    await SecureStore.setItemAsync('some-key', 'some-val', {
+        keychainService: "some-service",
+        keychainAccessible: SecureStore.WHEN_PASSCODE_SET_THIS_DEVICE_ONLY,
+    });
+    const result = await SecureStore.getItemAsync('some-key', { keychainService: "some-service" });
+    if (result != null) {
+        result.slice() === 'some-val';
+    }
+    await SecureStore.deleteItemAsync('some-key', { keychainService: "some-service" });
+};
+
+const allSecureStoreKeychainAccessibleValues: number[] = [
+    SecureStore.WHEN_UNLOCKED,
+    SecureStore.AFTER_FIRST_UNLOCK,
+    SecureStore.ALWAYS,
+    SecureStore.WHEN_UNLOCKED_THIS_DEVICE_ONLY,
+    SecureStore.WHEN_PASSCODE_SET_THIS_DEVICE_ONLY,
+    SecureStore.AFTER_FIRST_UNLOCK_THIS_DEVICE_ONLY,
+    SecureStore.ALWAYS_THIS_DEVICE_ONLY,
+];
+// #endregion
+
 () => (
     <Svg width={100} height={50}>
         <Svg.Rect
diff --git a/types/expo/index.d.ts b/types/expo/index.d.ts
index 2cb20ae065..171dbc52b6 100644
--- a/types/expo/index.d.ts
+++ b/types/expo/index.d.ts
@@ -14,6 +14,7 @@
 //                 Levan Basharuli <https://github.com/levansuper>
 //                 Pavel Ihm <https://github.com/ihmpavel>
 //                 Bartosz Dotryw <https://github.com/burtek>
+//                 Jason Killian <https://github.com/jkillian>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.8
 
@@ -2301,12 +2302,23 @@ export namespace ScreenOrientation {
 export namespace SecureStore {
     interface SecureStoreOptions {
         keychainService?: string;
+    }
+
+    interface SecureStoreSetOptions extends SecureStoreOptions {
         keychainAccessible?: number;
     }
 
-    function setItemAsync(key: string, value: string, options?: SecureStoreOptions): Promise<void>;
+    function setItemAsync(key: string, value: string, options?: SecureStoreSetOptions): Promise<void>;
     function getItemAsync(key: string, options?: SecureStoreOptions): Promise<string | null>;
     function deleteItemAsync(key: string, options?: SecureStoreOptions): Promise<void>;
+
+    const WHEN_UNLOCKED: number;
+    const AFTER_FIRST_UNLOCK: number;
+    const ALWAYS: number;
+    const WHEN_UNLOCKED_THIS_DEVICE_ONLY: number;
+    const WHEN_PASSCODE_SET_THIS_DEVICE_ONLY: number;
+    const AFTER_FIRST_UNLOCK_THIS_DEVICE_ONLY: number;
+    const ALWAYS_THIS_DEVICE_ONLY: number;
 }
 
 /**