diff --git a/Classes/WizardViewController.m b/Classes/WizardViewController.m
index 2b2be7e94..bdd693925 100644
--- a/Classes/WizardViewController.m
+++ b/Classes/WizardViewController.m
@@ -388,13 +388,13 @@ static UICompositeViewDescription *compositeDescription = nil;
     if(server == nil) {
         server = domain;
     }
+	LinphoneProxyConfig* proxyCfg = linphone_core_create_proxy_config([LinphoneManager getLc]);
     char normalizedUserName[256];
     LinphoneAddress* linphoneAddress = linphone_address_new("sip:user@domain.com");
-    linphone_proxy_config_normalize_number(NULL, [username cStringUsingEncoding:[NSString defaultCStringEncoding]], normalizedUserName, sizeof(normalizedUserName));
+    linphone_proxy_config_normalize_number(proxyCfg, [username cStringUsingEncoding:[NSString defaultCStringEncoding]], normalizedUserName, sizeof(normalizedUserName));
     linphone_address_set_username(linphoneAddress, normalizedUserName);
     linphone_address_set_domain(linphoneAddress, [domain UTF8String]);
     const char* identity = linphone_address_as_string_uri_only(linphoneAddress);
-	LinphoneProxyConfig* proxyCfg = linphone_core_create_proxy_config([LinphoneManager getLc]);
 	LinphoneAuthInfo* info = linphone_auth_info_new([username UTF8String], NULL, [password UTF8String], NULL, NULL);
 	linphone_proxy_config_set_identity(proxyCfg, identity);
 	linphone_proxy_config_set_server_addr(proxyCfg, [server UTF8String]);