diff --git a/test/test.go b/test/test.go
index 9c6327b..d0b2900 100644
--- a/test/test.go
+++ b/test/test.go
@@ -217,8 +217,8 @@ func New(t *testing.T, req Request) (env *TestEnv, err error) {
 		state:      running,
 		ClientReq:  req,
 		ServiceReq: req.clone(),
-		ServiceRes: Response{},
-		ClientRes:  Response{},
+		ServiceRes: Response{Headers: make(http.Header)},
+		ClientRes:  Response{Headers: make(http.Header)},
 	}
 
 	b := bridge.New(bridgetest.MockFunc(env)) // check