diff --git a/Auth/FirebaseAuthUI/FUIAuth.m b/Auth/FirebaseAuthUI/FUIAuth.m
index f4203ffbbb1..c1cd263f822 100644
--- a/Auth/FirebaseAuthUI/FUIAuth.m
+++ b/Auth/FirebaseAuthUI/FUIAuth.m
@@ -243,7 +243,7 @@ - (void)autoUpgradeAccountWithProviderUI:(id<FUIAuthProvider>)providerUI
         // Check for and handle special case for Phone Auth Provider.
         if (providerUI.providerID == FIRPhoneAuthProviderID) {
           // Obtain temporary Phone Auth credential.
-          newCredential = error.userInfo[FIRAuthUpdatedCredentialKey];
+          newCredential = error.userInfo[FIRAuthErrorUserInfoUpdatedCredentialKey];
         }
         NSDictionary *userInfo = @{
           FUIAuthCredentialKey : newCredential,