diff --git a/imgsrv.go b/imgsrv.go
index 90f8294..39b0ccd 100644
--- a/imgsrv.go
+++ b/imgsrv.go
@@ -10,8 +10,8 @@ package main
 import (
 	"flag"
 	"fmt"
-	"github.com/vbatts/imgsrv/config"
 	"github.com/vbatts/imgsrv/client"
+	"github.com/vbatts/imgsrv/config"
 	"github.com/vbatts/imgsrv/util"
 	"labix.org/v2/mgo"
 	"log"
diff --git a/server.go b/server.go
index 2e7cb79..4c31d6e 100644
--- a/server.go
+++ b/server.go
@@ -720,6 +720,7 @@ func routeAssets(w http.ResponseWriter, r *http.Request) {
 	switch path {
 	case "bootstrap.css":
 		fmt.Fprint(w, bootstrapCSS)
+		w.Header().Set("Cache-Control", "max-age=315360000")
 		w.Header().Set("Content-Type", "text/css")
 	}
 }