diff --git a/lib/modules/functions/index.js b/lib/modules/functions/index.js
index 47ed054b..bf4ac63a 100644
--- a/lib/modules/functions/index.js
+++ b/lib/modules/functions/index.js
@@ -18,6 +18,26 @@ import type {
 export const NAMESPACE = 'functions';
 export const MODULE_NAME = 'RNFirebaseFunctions';
 
+/**
+ * -------------
+ *   INTERNALS
+ * -------------
+ */
+function errorOrResult(possibleError): HttpsCallablePromise {
+  if (isObject(possibleError) && possibleError.__error) {
+    const { code, message, details } = possibleError;
+    return Promise.reject(
+      new HttpsError(
+        statics.HttpsErrorCode[code] || statics.HttpsErrorCode.UNKNOWN,
+        message,
+        details
+      )
+    );
+  }
+
+  return Promise.resolve(possibleError);
+}
+
 export default class Functions extends ModuleBase {
   constructor(app: App) {
     super(app, {
@@ -41,29 +61,9 @@ export default class Functions extends ModuleBase {
   httpsCallable(name: string): HttpsCallable {
     return (data?: any): HttpsCallablePromise => {
       const promise = getNativeModule(this).httpsCallable(name, { data });
-      return promise.then(this._errorOrResult);
+      return promise.then(errorOrResult);
     };
   }
-
-  /**
-   * -------------
-   *   INTERNALS
-   * -------------
-   */
-  _errorOrResult(possibleError): HttpsCallablePromise {
-    if (isObject(possibleError) && possibleError.__error) {
-      const { code, message, details } = possibleError;
-      return Promise.reject(
-        new HttpsError(
-          statics.HttpsErrorCode[code] || statics.HttpsErrorCode.UNKNOWN,
-          message,
-          details
-        )
-      );
-    }
-
-    return Promise.resolve(possibleError);
-  }
 }
 
 export const statics: { HttpsErrorCode: HttpsErrorCode } = {