diff --git a/History.txt b/History.txt
index 7f5ce32..95ede56 100644
--- a/History.txt
+++ b/History.txt
@@ -1,3 +1,8 @@
+=== Upcoming
+
+* Bug fix
+  * Fix thread-safety race condition. Issue #2.
+
 === 1.4.1
 
 * Bug fix
diff --git a/lib/net/http/digest_auth.rb b/lib/net/http/digest_auth.rb
index 080f286..28904c3 100644
--- a/lib/net/http/digest_auth.rb
+++ b/lib/net/http/digest_auth.rb
@@ -138,7 +138,7 @@ def auth_header uri, www_authenticate, method, iis = false
       "nonce=\"#{params['nonce']}\"",
       if qop then
         [
-          "nc=#{'%08x' % @nonce_count}",
+          "nc=#{'%08x' % nonce_count}",
           "cnonce=\"#{cnonce}\"",
         ]
       end,