diff --git a/lib/NTLM_No_Proxy.js b/lib/NTLM_No_Proxy.js
index 0264b98..feff530 100644
--- a/lib/NTLM_No_Proxy.js
+++ b/lib/NTLM_No_Proxy.js
@@ -6,6 +6,7 @@ NTLM_No_Proxy.prototype.close = function() {
 
 };
 
+const NEGOTIATE_UNICODE     = 1;
 const NEGOTIATE_OEM         = 1 << 1;
 const REQUEST_TARGET        = 1 << 2;
 const NEGOTIATE_NTLM_KEY    = 1 << 9;
@@ -15,11 +16,12 @@ const NEGOTIATE_TARGET_INFO = 1 << 23;
 
 NTLM_No_Proxy.prototype.negotiate = function(ntlm_negotiate, negotiate_callback) {
     const target_name = 'ALPHA';
-    let challenge_flags = NEGOTIATE_OEM | REQUEST_TARGET | TARGET_TYPE_DOMAIN;
+    let challenge_flags = NEGOTIATE_OEM | REQUEST_TARGET | TARGET_TYPE_DOMAIN;
 
     // Follow requested NTLM protocol version
     const request_flags = ntlm_negotiate.readUInt32LE(12);
     const ntlm_version = request_flags & NEGOTIATE_NTLM2_KEY ? 2 : 1;
+    const is_unicode = request_flags & NEGOTIATE_UNICODE;
     let header_len;
     let data_len;
 
@@ -32,6 +34,10 @@ NTLM_No_Proxy.prototype.negotiate = function(ntlm_negotiate, negotiate_callback)
       header_len = 40;
       data_len = target_name.length;
     }
+	
+    if (is_unicode) {
+      challenge_flags |= NEGOTIATE_UNICODE;
+    }
 
     let challenge = new Buffer(header_len + data_len);
     let offset = 0;