@@ -247,6 +247,7 @@ func getImagesJSON(eng *engine.Engine, version float64, w http.ResponseWriter, r

 				outsLegacy.Add(outLegacy)

 			}

 		}

+		w.Header().Set("Content-Type", "application/json")

 		if _, err := outsLegacy.WriteListTo(w); err != nil {

 			return err

 		}

@@ -350,6 +351,7 @@ func getContainersJSON(eng *engine.Engine, version float64, w http.ResponseWrite

 			ports.ReadListFrom([]byte(out.Get("Ports")))

 			out.Set("Ports", displayablePorts(ports))

 		}

+		w.Header().Set("Content-Type", "application/json")

 		if _, err = outs.WriteListTo(w); err != nil {

 			return err

 		}