diff --git a/climate-server.go b/climate-server.go
index 73a4ec5..27d8bab 100644
--- a/climate-server.go
+++ b/climate-server.go
@@ -50,7 +50,7 @@ func startServer() {
 func showCharts(w http.ResponseWriter, r *http.Request) {
 	if countStr := mux.Vars(r)["mins"]; countStr != "" {
 		if _, err := strconv.ParseInt(countStr, 10, 0); err != nil {
-			http.Redirect(w, r, ROOT_URL + "/", 303)
+			http.Redirect(w, r, "/" + ROOT_URL + "/", 303)
 		}
 	}
 	http.ServeFile(w, r, "charts.html")