diff --git a/packages/react-native-compat/index.js b/packages/react-native-compat/index.js
index 9ae7d203b..89e7f457e 100644
--- a/packages/react-native-compat/index.js
+++ b/packages/react-native-compat/index.js
@@ -14,6 +14,24 @@ if (typeof Buffer === "undefined") {
   global.Buffer = require("buffer").Buffer;
 }
 
+// Polyfill btoa
+if (typeof btoa === "undefined") {
+  global.btoa = function (str) {
+    return Buffer.alloc(str.length, str, "binary").toString("base64");
+  };
+}
+
+// Polyfill atob
+if (typeof atob === "undefined") {
+  global.atob = function (b64Encoded) {
+    return Buffer.alloc(
+      Buffer.from(b64Encoded, "base64").length,
+      Buffer.from(b64Encoded, "base64"),
+      "binary",
+    ).toString("binary");
+  };
+}
+
 if (typeof global?.Linking === "undefined") {
   try {
     global.Linking = require("react-native").Linking;