diff --git a/evernote-sdk-ios/ENSDK/ENSession.m b/evernote-sdk-ios/ENSDK/ENSession.m
index 83c4f57..951b72b 100644
--- a/evernote-sdk-ios/ENSDK/ENSession.m
+++ b/evernote-sdk-ios/ENSDK/ENSession.m
@@ -299,7 +299,7 @@ - (void)selectInitialSessionHost
     } else {
         // Choose the initial host based on locale. Simplified Chinese locales get the yinxiang service.
         NSString * locale = [[[NSLocale currentLocale] localeIdentifier] lowercaseString];
-        if ([locale hasPrefix:@"zh-hans"] || [locale isEqualToString:@"zh-cn"] || [locale isEqualToString:@"zh"]) {
+        if ([locale hasPrefix:@"zh-hans"] || [locale isEqualToString:@"zh-cn"] || [locale isEqualToString:@"zh"]|| [locale isEqualToString:@"zh_cn"]) {
             self.sessionHost = ENSessionBootstrapServerBaseURLStringCN;
         } else {
             self.sessionHost = ENSessionBootstrapServerBaseURLStringUS;