diff --git a/handlers/proxy.go b/handlers/proxy.go
index 3f85baa..420b79c 100644
--- a/handlers/proxy.go
+++ b/handlers/proxy.go
@@ -53,6 +53,7 @@ func ImageProxy(l *logrus.Logger) http.HandlerFunc {
 		}
 
 		w.Header().Add("Content-type", fmt.Sprintf("image/%s", ext))
+		w.Header().Add("Cache-Control", "max-age=1296000")
 		if _, err = io.Copy(w, res.Body); err != nil {
 			l.Errorln("unable to write image", err)
 		}