diff --git a/core/plug-in/uac_auth/UACAuth.cpp b/core/plug-in/uac_auth/UACAuth.cpp
index bdec29e4..8d37470d 100644
--- a/core/plug-in/uac_auth/UACAuth.cpp
+++ b/core/plug-in/uac_auth/UACAuth.cpp
@@ -362,7 +362,7 @@ bool UACAuth::do_auth(const unsigned int code, const string& auth_hdr,
   if (!qop_value.empty())
     result += "qop=" + qop_value + ", "
       "cnonce=\"" + cnonce + "\", "
-      "nc=\"" + int2hex(nonce_count,true) + "\", ";
+      "nc=" + int2hex(nonce_count,true) + ", ";
 
   result += "response=\"" + string((char*)response) + "\", algorithm=MD5\n";