diff --git a/webapp/go/main.go b/webapp/go/main.go
index 2064123..eb0c441 100644
--- a/webapp/go/main.go
+++ b/webapp/go/main.go
@@ -65,6 +65,7 @@ func connectDB(logger echo.Logger) (*sqlx.DB, error) {
 	conf.Passwd = "isucon"
 	conf.DBName = "isupipe"
 	conf.ParseTime = true
+	conf.InterpolateParams = true
 
 	if v, ok := os.LookupEnv(networkTypeEnvKey); ok {
 		conf.Net = v