diff --git a/vendor/github.com/jhump/protoreflect/desc/descriptor_no_unsafe.go b/vendor/github.com/jhump/protoreflect/desc/descriptor_no_unsafe.go
new file mode 100644
index 0000000..cd7348e
--- /dev/null
+++ b/vendor/github.com/jhump/protoreflect/desc/descriptor_no_unsafe.go
@@ -0,0 +1,31 @@
+//+build appengine gopherjs purego
+// NB: other environments where unsafe is unappropriate should use "purego" build tag
+// https://github.com/golang/go/issues/23172
+
+package desc
+
+type jsonNameMap struct{}
+type memoizedDefault struct{}
+
+// FindFieldByJSONName finds the field with the given JSON field name. If no such
+// field exists then nil is returned. Only regular fields are returned, not
+// extensions.
+func (md *MessageDescriptor) FindFieldByJSONName(jsonName string) *FieldDescriptor {
+	// NB: With allowed use of unsafe, we use it to atomically define an index
+	// via atomic.LoadPointer/atomic.StorePointer. Without it, we skip the index
+	// and do an linear scan of fields each time.
+	for _, f := range md.fields {
+		jn := f.proto.GetJsonName()
+		if jn == "" {
+			jn = f.proto.GetName()
+		}
+		if jn == jsonName {
+			return f
+		}
+	}
+	return nil
+}
+
+func (fd *FieldDescriptor) getDefaultValue() interface{} {
+	return fd.determineDefault()
+}