diff --git a/lib/data/repositories/auth_repository.dart b/lib/data/repositories/auth_repository.dart
index 032d1d5a3..b59c24ae5 100644
--- a/lib/data/repositories/auth_repository.dart
+++ b/lib/data/repositories/auth_repository.dart
@@ -21,10 +21,11 @@ class AuthRepository {
   final WebClient webClient;
 
   Future<LoginResponse> signUp({
-    String url,
-    String email,
-    String password,
-    String secret,
+    @required String url,
+    @required String email,
+    @required String password,
+    @required String secret,
+    @required String referralCode,
   }) async {
     final credentials = {
       'email': email,
@@ -39,12 +40,15 @@ class AuthRepository {
     }
 
     return sendRequest(
-        url: formatApiUrl(url) + '/signup', data: credentials, secret: secret);
+        url: formatApiUrl(url) + '/signup?rc=$referralCode',
+        data: credentials,
+        secret: secret);
   }
 
   Future<LoginResponse> oauthSignUp({
     @required String idToken,
     @required String accessToken,
+    @required String referralCode,
   }) async {
     final credentials = {
       'terms_of_service': true,
@@ -56,7 +60,8 @@ class AuthRepository {
     };
 
     return sendRequest(
-        url: formatApiUrl(Constants.hostedApiUrl) + '/oauth_login?create=true',
+        url: formatApiUrl(Constants.hostedApiUrl) +
+            '/oauth_login?create=true&rc=$referralCode',
         data: credentials,
         secret: Config.API_SECRET);
   }
diff --git a/lib/redux/app/app_state.dart b/lib/redux/app/app_state.dart
index 11082bbcc..468c4ad9d 100644
--- a/lib/redux/app/app_state.dart
+++ b/lib/redux/app/app_state.dart
@@ -94,8 +94,8 @@ abstract class AppState implements Built<AppState, AppStateBuilder> {
   factory AppState({
     @required PrefState prefState,
     @required bool reportErrors,
-    @required String referralCode,
     String url,
+    String referralCode,
     String currentRoute,
   }) {
     return _$AppState._(
diff --git a/lib/redux/auth/auth_middleware.dart b/lib/redux/auth/auth_middleware.dart
index 1312d1b4f..f8d21768b 100644
--- a/lib/redux/auth/auth_middleware.dart
+++ b/lib/redux/auth/auth_middleware.dart
@@ -124,12 +124,13 @@ Middleware<AppState> _createLoginRequest(AuthRepository repository) {
 Middleware<AppState> _createSignUpRequest(AuthRepository repository) {
   return (Store<AppState> store, dynamic dynamicAction, NextDispatcher next) {
     final action = dynamicAction as UserSignUpRequest;
+    final state = store.state;
 
     repository
         .signUp(
-      email: action.email,
-      password: action.password,
-    )
+            email: action.email,
+            password: action.password,
+            referralCode: state.authState.referralCode)
         .then((data) {
       _saveAuthLocal(kAppProductionUrl);
 
@@ -188,12 +189,13 @@ Middleware<AppState> _createOAuthLoginRequest(AuthRepository repository) {
 Middleware<AppState> _createOAuthSignUpRequest(AuthRepository repository) {
   return (Store<AppState> store, dynamic dynamicAction, NextDispatcher next) {
     final action = dynamicAction as OAuthSignUpRequest;
+    final state = store.state;
 
     repository
         .oauthSignUp(
-      accessToken: action.accessToken,
-      idToken: action.idToken,
-    )
+            accessToken: action.accessToken,
+            idToken: action.idToken,
+            referralCode: state.authState.referralCode)
         .then((data) {
       _saveAuthLocal(kAppProductionUrl);
 
diff --git a/lib/redux/auth/auth_state.dart b/lib/redux/auth/auth_state.dart
index 22570025e..b1cfa90ac 100644
--- a/lib/redux/auth/auth_state.dart
+++ b/lib/redux/auth/auth_state.dart
@@ -15,7 +15,7 @@ abstract class AuthState implements Built<AuthState, AuthStateBuilder> {
       isAuthenticated: false,
       isInitialized: false,
       lastEnteredPasswordAt: 0,
-      referralCode: referralCode,
+      referralCode: referralCode ?? '',
     );
   }