diff --git a/register.go b/register.go
index 4628d95..5d2b4f5 100644
--- a/register.go
+++ b/register.go
@@ -12,6 +12,7 @@ type API struct {
 	routerGroup          *gin.RouterGroup
 	jwtSecret            []byte
 	authenticationHeader string
+	modelRegistry        []mgocrud.ModelInterface
 }
 
 // Context is gin.Context with extras
@@ -23,19 +24,19 @@ type Context struct {
 
 // New returns new instance of the API
 func New(connection mgocrud.Connection, dbname string, routerGroup *gin.RouterGroup) *API {
+	modelRegistry := make([]mgocrud.ModelInterface, 0)
 	return &API{
-		DBConnection: connection,
-		DBName:       dbname,
-		routerGroup:  routerGroup,
+		DBConnection:  connection,
+		DBName:        dbname,
+		routerGroup:   routerGroup,
+		modelRegistry: modelRegistry,
 	}
 }
 
-var modelRegistry = make([]mgocrud.ModelInterface, 0)
-
 // RegisterModel setups gin routes for model GET, POST, PUT and DELETE
 func (api *API) RegisterModel(m mgocrud.ModelInterface) {
 
-	modelRegistry = append(modelRegistry, m)
+	api.modelRegistry = append(api.modelRegistry, m)
 
 	session := api.DBConnection.NewSession()
 	defer session.Close()
@@ -75,7 +76,7 @@ func (api *API) AddMetaRoute(route string) {
 	api.routerGroup.GET(route, func(c *gin.Context) {
 		modelMeta := make(map[string]interface{})
 
-		for _, m := range modelRegistry {
+		for _, m := range api.modelRegistry {
 			modelMeta[mgocrud.GetCollectionName(m)] = getModelMeta(m)
 		}
 
@@ -84,7 +85,7 @@ func (api *API) AddMetaRoute(route string) {
 		})
 	})
 
-	for _, m := range modelRegistry {
+	for _, m := range api.modelRegistry {
 		api.routerGroup.GET("/_meta/"+mgocrud.GetCollectionName(m), api.collectionGetMetaHandler(m))
 	}