diff --git a/lib/cpp/src/Thrift.h b/lib/cpp/src/Thrift.h
index 07ccb97..4a3df65 100644
--- a/lib/cpp/src/Thrift.h
+++ b/lib/cpp/src/Thrift.h
@@ -134,6 +134,12 @@
 };
 
 
+// Forward declare this structure used by TDenseProtocol
+namespace reflection { namespace local {
+struct TypeSpec;
+}}
+
+
 }} // facebook::thrift
 
 #endif // #ifndef _THRIFT_THRIFT_H_