diff --git a/buffet/states/error_codes.cc b/buffet/states/error_codes.cc
new file mode 100644
index 0000000..3faea7e
--- /dev/null
+++ b/buffet/states/error_codes.cc
@@ -0,0 +1,20 @@
+// Copyright 2014 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "buffet/states/error_codes.h"
+
+namespace buffet {
+namespace errors {
+namespace state {
+
+const char kDomain[] = "buffet_state";
+
+const char kPackageNameMissing[] = "package_name_missing";
+const char kPropertyNameMissing[] = "property_name_missing";
+const char kPropertyNotDefined[] = "property_not_defined";
+const char kPropertyRedefinition[] = "property_redefinition";
+
+}  // namespace state
+}  // namespace errors
+}  // namespace buffet