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diff --git a/src/include/fst/script/disambiguate.h b/src/include/fst/script/disambiguate.h
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+++ b/src/include/fst/script/disambiguate.h
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+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Copyright 2005-2010 Google, Inc.
+// Author: riley@google.com (Jake Ratkiewicz)
+
+#ifndef FST_SCRIPT_DISAMBIGUATE_H_
+#define FST_SCRIPT_DISAMBIGUATE_H_
+
+#include <fst/disambiguate.h>
+#include <fst/script/arg-packs.h>
+#include <fst/script/fst-class.h>
+#include <fst/script/weight-class.h>
+
+namespace fst {
+namespace script {
+
+struct DisambiguateOptions {
+  float delta;
+  WeightClass weight_threshold;
+  int64 state_threshold;
+  int64 subsequential_label;
+
+  explicit DisambiguateOptions(float d = fst::kDelta,
+                              WeightClass w =
+                                fst::script::WeightClass::Zero(),
+                              int64 n = fst::kNoStateId, int64 l = 0)
+      : delta(d), weight_threshold(w), state_threshold(n),
+        subsequential_label(l) {}
+};
+
+typedef args::Package<const FstClass&, MutableFstClass*,
+                      const DisambiguateOptions &> DisambiguateArgs;
+
+template<class Arc>
+void Disambiguate(DisambiguateArgs *args) {
+  const Fst<Arc> &ifst = *(args->arg1.GetFst<Arc>());
+  MutableFst<Arc> *ofst = args->arg2->GetMutableFst<Arc>();
+  const DisambiguateOptions &opts = args->arg3;
+
+  fst::DisambiguateOptions<Arc> detargs;
+  detargs.delta = opts.delta;
+  detargs.weight_threshold =
+      *(opts.weight_threshold.GetWeight<typename Arc::Weight>());
+  detargs.state_threshold = opts.state_threshold;
+  detargs.subsequential_label = opts.subsequential_label;
+
+  Disambiguate(ifst, ofst, detargs);
+}
+
+void Disambiguate(const FstClass &ifst, MutableFstClass *ofst,
+                 const DisambiguateOptions &opts =
+                   fst::script::DisambiguateOptions());
+
+}  // namespace script
+}  // namespace fst
+
+#endif  // FST_SCRIPT_DISAMBIGUATE_H_