diff --git a/packages/primus-client/lib/index.js b/packages/primus-client/lib/index.js
index 9e0c1d9f6d..afd97f05b7 100644
--- a/packages/primus-client/lib/index.js
+++ b/packages/primus-client/lib/index.js
@@ -13,13 +13,13 @@ function primusClient (connection, options) {
     }));
   };
 
-  const initialize = function () {
-    if (typeof this.defaultService === 'function') {
+  const initialize = function (app) {
+    if (typeof app.defaultService === 'function') {
       throw new Error('Only one default client provider can be configured');
     }
 
-    this.primus = connection;
-    this.defaultService = defaultService;
+    app.primus = connection;
+    app.defaultService = defaultService;
   };
 
   initialize.Service = Service;
diff --git a/packages/rest-client/lib/index.js b/packages/rest-client/lib/index.js
index dfa31bce8f..e486b54cf8 100644
--- a/packages/rest-client/lib/index.js
+++ b/packages/rest-client/lib/index.js
@@ -32,13 +32,13 @@ function restClient (base = '') {
         return new Service({ base, name, connection, options });
       };
 
-      const initialize = function () {
-        if (typeof this.defaultService === 'function') {
+      const initialize = function (app) {
+        if (typeof app.defaultService === 'function') {
           throw new Error('Only one default client provider can be configured');
         }
 
-        this.rest = connection;
-        this.defaultService = defaultService;
+        app.rest = connection;
+        app.defaultService = defaultService;
       };
 
       initialize.Service = Service;
diff --git a/packages/socketio-client/lib/index.js b/packages/socketio-client/lib/index.js
index e244945327..e31ec04f8f 100644
--- a/packages/socketio-client/lib/index.js
+++ b/packages/socketio-client/lib/index.js
@@ -19,13 +19,13 @@ function socketioClient (connection, options) {
     return new Service(settings);
   };
 
-  const initialize = function () {
-    if (typeof this.defaultService === 'function') {
+  const initialize = function (app) {
+    if (typeof app.defaultService === 'function') {
       throw new Error('Only one default client provider can be configured');
     }
 
-    this.io = connection;
-    this.defaultService = defaultService;
+    app.io = connection;
+    app.defaultService = defaultService;
   };
 
   initialize.Service = Service;