diff --git a/digest_auth_client.go b/digest_auth_client.go
index 321d1d8..0d8ef8f 100644
--- a/digest_auth_client.go
+++ b/digest_auth_client.go
@@ -46,6 +46,7 @@
 	dr.Password = password
 	dr.URI = uri
 	dr.Username = username
+	dr.Header = make(map[string][]string)
 	return dr
 }