diff --git a/ryu/base/app_manager.py b/ryu/base/app_manager.py
index 21e129b5..883ca49c 100644
--- a/ryu/base/app_manager.py
+++ b/ryu/base/app_manager.py
@@ -149,6 +149,15 @@ class RyuApp(object):
 
 
 class AppManager(object):
+    # singletone
+    _instance = None
+
+    @staticmethod
+    def get_instance():
+        if not AppManager._instance:
+            AppManager._instance = AppManager()
+        return AppManager._instance
+
     def __init__(self):
         self.applications_cls = {}
         self.applications = {}
diff --git a/ryu/cmd/manager.py b/ryu/cmd/manager.py
index 83867054..82dc60a1 100755
--- a/ryu/cmd/manager.py
+++ b/ryu/cmd/manager.py
@@ -63,7 +63,7 @@ def main():
 
     app_lists = CONF.app_lists + CONF.app
 
-    app_mgr = AppManager()
+    app_mgr = AppManager.get_instance()
     app_mgr.load_apps(app_lists)
     contexts = app_mgr.create_contexts()
     app_mgr.instantiate_apps(**contexts)