diff --git a/src/config.ts b/src/config.ts
index a98c98d..8c24f67 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -1,8 +1,7 @@
 import { Condition } from './condition';
-import { CookiePersister } from './cookiePersister';
 import { removeAbTestParameter } from './query';
 import { ConsoleTracking, Tracking } from './tracking';
-import { UserSessionPersister } from './userSessionPersister';
+import { CookiePersister, UserSessionPersister } from './userSessionPersister';
 
 export interface Config {
     cookieName: string;
diff --git a/src/cookiePersister.ts b/src/cookiePersister.ts
deleted file mode 100644
index 8ff6587..0000000
--- a/src/cookiePersister.ts
+++ /dev/null
@@ -1,33 +0,0 @@
-import config from './config';
-import { UserSessionPersister } from './userSessionPersister';
-
-export class CookiePersister implements UserSessionPersister {
-  private static createCookie(name: string, value: string, days: number): void {
-      let expires = '';
-      if (days) {
-          const date = new Date();
-          date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
-          expires = '; expires=' + date.toUTCString();
-      }
-      document.cookie = name + '=' + value + expires + '; path=/';
-  }
-  private static readCookie(name: string): string | null {
-      const nameEq = name + '=';
-      const ca = document.cookie.split(';');
-      for (let c of ca) {
-          while (c.charAt(0) === ' ') {
-              c = c.substring(1, c.length);
-          }
-          if (c.indexOf(nameEq) === 0) {
-              return c.substring(nameEq.length, c.length);
-          }
-      }
-      return null;
-  }
-  public loadUserSession() {
-      return CookiePersister.readCookie(config.cookieName);
-  }
-  public saveUserSession(userSession: string, daysToLive: number) {
-      CookiePersister.createCookie(config.cookieName, userSession, daysToLive);
-  }
-}
diff --git a/src/index.ts b/src/index.ts
index 5f36f41..c520121 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,4 +1,3 @@
-import { CookiePersister } from './cookiePersister';
 import { InMemoryPersister } from './inMemoryPersister';
 import {
     config,
@@ -14,7 +13,7 @@ import {
 } from './main';
 import { SplitTest } from './splitTest';
 import { uiFactory } from './ui';
-import { UserSessionPersister } from './userSessionPersister';
+import { CookiePersister, UserSessionPersister } from './userSessionPersister';
 
 const ui = uiFactory(
     testsObservable,
diff --git a/src/userSessionPersister.ts b/src/userSessionPersister.ts
index bbdf19b..ebc03ff 100644
--- a/src/userSessionPersister.ts
+++ b/src/userSessionPersister.ts
@@ -3,3 +3,33 @@ export interface UserSessionPersister {
     loadUserSession(): string | null;
     saveUserSession(userSession: string, daysToLive: number): void;
 }
+export class CookiePersister implements UserSessionPersister {
+  private static createCookie(name: string, value: string, days: number): void {
+      let expires = '';
+      if (days) {
+          const date = new Date();
+          date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
+          expires = '; expires=' + date.toUTCString();
+      }
+      document.cookie = name + '=' + value + expires + '; path=/';
+  }
+  private static readCookie(name: string): string | null {
+      const nameEq = name + '=';
+      const ca = document.cookie.split(';');
+      for (let c of ca) {
+          while (c.charAt(0) === ' ') {
+              c = c.substring(1, c.length);
+          }
+          if (c.indexOf(nameEq) === 0) {
+              return c.substring(nameEq.length, c.length);
+          }
+      }
+      return null;
+  }
+  public loadUserSession() {
+      return CookiePersister.readCookie(config.cookieName);
+  }
+  public saveUserSession(userSession: string, daysToLive: number) {
+    CookiePersister.createCookie(config.cookieName, userSession, daysToLive);
+  }
+}