diff --git a/1.2/HalPolicy.hpp b/1.2/HalPolicy.hpp
index 9fb7457..bf4540a 100644
--- a/1.2/HalPolicy.hpp
+++ b/1.2/HalPolicy.hpp
@@ -159,6 +159,10 @@
     static bool ConvertTranspose(const Operation& operation, const Model& model, ConversionData& data);
 
     static bool ConvertTransposeConv2d(const Operation& operation, const Model& model, ConversionData& data);
+
+    static bool ConvertUnidirectionalSequenceLstm(const Operation& operation,
+                                                  const Model& model,
+                                                  ConversionData& data);
 };
 
 } // namespace hal_1_2