diff --git a/compiler/cpp/src/generate/t_js_generator.cc b/compiler/cpp/src/generate/t_js_generator.cc
index 7c42c01..c9ad467 100644
--- a/compiler/cpp/src/generate/t_js_generator.cc
+++ b/compiler/cpp/src/generate/t_js_generator.cc
@@ -815,7 +815,7 @@
                << indent() << "  input.skip(Thrift.Type.STRUCT);" << endl
                << indent() << "  input.readMessageEnd();" << endl
                << indent() << "  var x = new Thrift.TApplicationException(Thrift.TApplicationExceptionType.UNKNOWN_METHOD, 'Unknown function ' + r.fname);" << endl
-               << indent() << "  output.writeMessageBegin(r.fname, Thrift.MessageType.Exception, r.rseqid);" << endl
+               << indent() << "  output.writeMessageBegin(r.fname, Thrift.MessageType.EXCEPTION, r.rseqid);" << endl
                << indent() << "  x.write(output);" << endl
                << indent() << "  output.writeMessageEnd();" << endl
                << indent() << "  output.flush();" << endl