diff --git a/config/config.go b/config/config.go
index 77b5d42..179c5f3 100644
--- a/config/config.go
+++ b/config/config.go
@@ -1,6 +1,10 @@
 package config
 
-import "local/args"
+import (
+	"io/ioutil"
+	"local/args"
+	"os"
+)
 
 type Config struct {
 	Port       int
@@ -14,8 +18,14 @@ type Config struct {
 func New() Config {
 	as := args.NewArgSet()
 
+	f, err := ioutil.TempFile(os.TempDir(), "bolt.db.*")
+	if err != nil {
+		panic(err)
+	}
+	f.Close()
+
 	as.Append(args.INT, "p", "port to listen on", 18114)
-	as.Append(args.STRING, "dburi", "database uri", "mongodb://localhost:27017")
+	as.Append(args.STRING, "dburi", "database uri", f.Name())
 	as.Append(args.STRING, "fileprefix", "path prefix for file service", "/__files__")
 	as.Append(args.STRING, "fileroot", "path to file hosting root", "/tmp/")
 	as.Append(args.STRING, "database", "database name to use", "db")