diff --git a/vendor/google.golang.org/protobuf/internal/impl/codec_unsafe.go b/vendor/google.golang.org/protobuf/internal/impl/codec_unsafe.go
new file mode 100644
index 0000000..e118af1
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/codec_unsafe.go
@@ -0,0 +1,17 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !purego,!appengine
+
+package impl
+
+// When using unsafe pointers, we can just treat enum values as int32s.
+
+var (
+	coderEnumNoZero      = coderInt32NoZero
+	coderEnum            = coderInt32
+	coderEnumPtr         = coderInt32Ptr
+	coderEnumSlice       = coderInt32Slice
+	coderEnumPackedSlice = coderInt32PackedSlice
+)