diff --git a/mongo/_example/main.go b/mongo/_example/main.go
index 88420f8557180d90ea5b6bc3b1eed0d94ec6a777..e5603dbd344bff7b238212c6cf0531c7f184b08d 100644
--- a/mongo/_example/main.go
+++ b/mongo/_example/main.go
@@ -3,6 +3,7 @@ package main
 import (
 	"fmt"
 	"log"
+	"os"
 	"time"
 
 	"upper.io/db"         // Imports the main db package.
@@ -23,6 +24,10 @@ type Birthday struct {
 
 func main() {
 
+	if os.Getenv("TEST_HOST") != "" {
+		settings.Host = os.Getenv("TEST_HOST")
+	}
+
 	// Attemping to establish a connection to the database.
 	sess, err := db.Open("mongo", settings)