diff --git a/ios/A0Auth0.mm b/ios/A0Auth0.mm
index 7276eb58..8c1ff0b4 100644
--- a/ios/A0Auth0.mm
+++ b/ios/A0Auth0.mm
@@ -81,7 +81,7 @@ - (dispatch_queue_t)methodQueue
 RCT_EXPORT_METHOD(initializeAuth0WithConfiguration:(NSString *)clientId
                                   domain:(NSString *)domain
               localAuthenticationOptions:(NSDictionary * _Nullable)localAuthenticationOptions
-                                  useDPoP:(NSNumber *)useDPoP
+                                  useDPoP:(nonnull NSNumber *)useDPoP
                                  resolve:(RCTPromiseResolveBlock)resolve
                                   reject:(RCTPromiseRejectBlock)reject) {
     [self tryAndInitializeNativeBridge:clientId domain:domain withLocalAuthenticationOptions:localAuthenticationOptions useDPoP:useDPoP resolve:resolve reject:reject];