diff --git a/vendor/github.com/gogo/protobuf/proto/pointer_reflect_gogo.go b/vendor/github.com/gogo/protobuf/proto/pointer_reflect_gogo.go
new file mode 100644
index 0000000..7ffd3c2
--- /dev/null
+++ b/vendor/github.com/gogo/protobuf/proto/pointer_reflect_gogo.go
@@ -0,0 +1,59 @@
+// Protocol Buffers for Go with Gadgets
+//
+// Copyright (c) 2018, The GoGo Authors. All rights reserved.
+// http://github.com/gogo/protobuf
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// +build purego appengine js
+
+// This file contains an implementation of proto field accesses using package reflect.
+// It is slower than the code in pointer_unsafe.go but it avoids package unsafe and can
+// be used on App Engine.
+
+package proto
+
+import (
+	"reflect"
+)
+
+// TODO: untested, so probably incorrect.
+
+func (p pointer) getRef() pointer {
+	return pointer{v: p.v.Addr()}
+}
+
+func (p pointer) appendRef(v pointer, typ reflect.Type) {
+	slice := p.getSlice(typ)
+	elem := v.asPointerTo(typ).Elem()
+	newSlice := reflect.Append(slice, elem)
+	slice.Set(newSlice)
+}
+
+func (p pointer) getSlice(typ reflect.Type) reflect.Value {
+	sliceTyp := reflect.SliceOf(typ)
+	slice := p.asPointerTo(sliceTyp)
+	slice = slice.Elem()
+	return slice
+}