diff --git a/lib/models/v3/Sequelize.ts b/lib/models/v3/Sequelize.ts
index ec1dc526..087b5ce6 100644
--- a/lib/models/v3/Sequelize.ts
+++ b/lib/models/v3/Sequelize.ts
@@ -11,28 +11,27 @@ import {ISequelizeAssociation} from "../../interfaces/ISequelizeAssociation";
 export class Sequelize extends SequelizeOrigin implements BaseSequelize {
 
   // to fix "$1" called with something that's not an instance of Sequelize.Model
-  Model: any = Function;
+  Model: any;
 
-  throughMap: { [through: string]: any } = {};
-  _: { [modelName: string]: typeof Model } = {};
+  throughMap: { [through: string]: any };
+  _: { [modelName: string]: typeof Model };
   init: (config: SequelizeConfig) => void;
   addModels: (models: Array<typeof Model> | string[]) => void;
   associateModels: (models: Array<typeof Model>) => void;
 
   constructor(config: SequelizeConfig | string) {
-
-    super(
-      (typeof config === "string") ?
-        config : // URI string
-        BaseSequelize.isISequelizeUriConfig(config) ?
-          config.uri : // URI string from ISequelizeUriConfig
-          BaseSequelize.prepareConfig(config) // Config object (ISequelizeConfig)
-    );
-
-    if (BaseSequelize.isISequelizeUriConfig(config)) {
-      this.options = {...this.options, ...config};
+    if (typeof config === "string") {
+      super(config)
+    } else if(BaseSequelize.isISequelizeUriConfig(config)) {
+      super(config.uri, config)
+    } else {
+      super(BaseSequelize.prepareConfig(config))
     }
 
+    this.throughMap = {}
+    this._ = {}
+    this.Model = Function
+
     if (typeof config !== "string") {
       this.init(config);
     }
diff --git a/lib/models/v4/Sequelize.ts b/lib/models/v4/Sequelize.ts
index dad83015..fe53fe14 100644
--- a/lib/models/v4/Sequelize.ts
+++ b/lib/models/v4/Sequelize.ts
@@ -9,26 +9,24 @@ import {ISequelizeAssociation} from "../../interfaces/ISequelizeAssociation";
 
 export class Sequelize extends OriginSequelize implements BaseSequelize {
 
-  throughMap: {[through: string]: any} = {};
-  _: {[modelName: string]: typeof Model} = {};
+  throughMap: {[through: string]: any};
+  _: {[modelName: string]: typeof Model};
   init: (config: SequelizeConfig) => void;
   addModels: (models: Array<typeof Model> | string[]) => void;
   associateModels: (models: Array<typeof Model>) => void;
 
   constructor(config: SequelizeConfig | string) {
-
-    super(
-      (typeof config === "string") ?
-        config : // URI string
-        BaseSequelize.isISequelizeUriConfig(config) ?
-          config.uri : // URI string from ISequelizeUriConfig
-          BaseSequelize.prepareConfig(config) // Config object (ISequelizeConfig)
-    );
-
-    if (BaseSequelize.isISequelizeUriConfig(config)) {
-      this.options = {...this.options, ...config};
+    if (typeof config === "string") {
+      super(config)
+    } else if(BaseSequelize.isISequelizeUriConfig(config)) {
+      super(config.uri, config)
+    } else {
+      super(BaseSequelize.prepareConfig(config))
     }
 
+    this.throughMap = {}
+    this._ = {}
+
     if (typeof config !== "string") {
       this.init(config);
     }