diff --git a/examples/demo3/src/backend/server/demo3_service.go b/examples/demo3/src/backend/server/demo3_service.go
index a93d86d37..f73b06c93 100644
--- a/examples/demo3/src/backend/server/demo3_service.go
+++ b/examples/demo3/src/backend/server/demo3_service.go
@@ -23,6 +23,7 @@ import (
 	"fmt"
 	"net/http"
 	"net/url"
+	"path"
 	"strconv"
 	"strings"
 	"sync"
@@ -119,6 +120,8 @@ func Init(envPath string, envName string) (port string, err error) {
 
 	// Retrieve environmental variable
 	var config util.Config
+	// trim file extension
+	envName = strings.TrimSuffix(envName, path.Ext(envName))
 	log.Info("Using config values from ", envPath, "/", envName)
 	config, err = util.LoadConfig(envPath, envName)
 	if err != nil {