diff --git a/getRandomBase64.expo.js b/getRandomBase64.expo.js
deleted file mode 100644
index 64e2db3..0000000
--- a/getRandomBase64.expo.js
+++ /dev/null
@@ -1,8 +0,0 @@
-const { NativeModules } = require('react-native')
-
-// In the Expo managed workflow the getRandomBase64 method is provided by ExpoRandom.getRandomBase64String
-if (!NativeModules.ExpoRandom) {
-  throw new Error('Expo managed workflow support for react-native-get-random-values is only available in SDK 39 and higher.')
-}
-
-module.exports = NativeModules.ExpoRandom.getRandomBase64String
diff --git a/getRandomBase64.js b/getRandomBase64.js
deleted file mode 100644
index 7a37f5b..0000000
--- a/getRandomBase64.js
+++ /dev/null
@@ -1 +0,0 @@
-module.exports = require('react-native').NativeModules.RNGetRandomValues.getRandomBase64
diff --git a/index.js b/index.js
index f702e34..df701c3 100644
--- a/index.js
+++ b/index.js
@@ -1,5 +1,5 @@
 const base64Decode = require('fast-base64-decode')
-const getRandomBase64 = require('./getRandomBase64')
+const { NativeModules } = require('react-native')
 
 class TypeMismatchError extends Error {}
 class QuotaExceededError extends Error {}
@@ -19,6 +19,20 @@ function insecureRandomValues (array) {
   return array
 }
 
+/**
+ * @param {number} byteLength
+ * @returns {string}
+ */
+function getRandomBase64 (byteLength) {
+  if (NativeModules.RNGetRandomValues) {
+    return NativeModules.RNGetRandomValues.getRandomBase64(byteLength)
+  } else if (NativeModules.ExpoRandom) {
+    return NativeModules.ExpoRandom.getRandomBase64String(byteLength)
+  } else {
+    throw new Error('Native module not found')
+  }
+}
+
 /**
  * @param {Int8Array|Uint8Array|Int16Array|Uint16Array|Int32Array|Uint32Array|Uint8ClampedArray} array
  */