diff --git a/packages/isolated-extension-api/src/extension/comand-registry.ts b/packages/isolated-extension-api/src/extension/comand-registry.ts
index c221939746a5d..02d1b409b1577 100644
--- a/packages/isolated-extension-api/src/extension/comand-registry.ts
+++ b/packages/isolated-extension-api/src/extension/comand-registry.ts
@@ -9,9 +9,9 @@
  *   Red Hat, Inc. - initial API and implementation
  */
 import { CommandRegistryExt, EXTENSION_RPC_CONTEXT as Ext, CommandRegistryMain } from '../api/extension-api';
-import { Disposable } from '@theia/core/lib/common/disposable';
 import { RPCProtocol } from '../api/rpc-protocol';
 import * as theia from 'theia';
+import { Disposable } from './types-impl';
 
 export type Handler = <T>(...args: any[]) => T | PromiseLike<T>;
 
diff --git a/packages/isolated-extension-api/src/extension/extension-context.ts b/packages/isolated-extension-api/src/extension/extension-context.ts
index e04044e02fc9e..50785ae12ce45 100644
--- a/packages/isolated-extension-api/src/extension/extension-context.ts
+++ b/packages/isolated-extension-api/src/extension/extension-context.ts
@@ -9,10 +9,10 @@
  *   Red Hat, Inc. - initial API and implementation
  */
 import { MAIN_RPC_CONTEXT } from '../api/extension-api';
-import { Disposable } from '@theia/core/lib/common/disposable';
 import { RPCProtocol } from '../api/rpc-protocol';
 import * as theia from 'theia';
 import { CommandRegistryImpl } from './comand-registry';
+import { Disposable } from './types-impl';
 
 export function createAPI(rpc: RPCProtocol): typeof theia {
     const commandRegistryExt = rpc.set(MAIN_RPC_CONTEXT.COMMAND_REGISTRY_EXT, new CommandRegistryImpl(rpc));
@@ -23,7 +23,8 @@ export function createAPI(rpc: RPCProtocol): typeof theia {
         }
     };
     return <typeof theia>{
-        commands
+        commands,
+        Disposable: Disposable
     };
 
 }
diff --git a/packages/isolated-extension-api/src/extension/types-impl.ts b/packages/isolated-extension-api/src/extension/types-impl.ts
new file mode 100644
index 0000000000000..0b5bc854716b4
--- /dev/null
+++ b/packages/isolated-extension-api/src/extension/types-impl.ts
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2018 Red Hat, Inc.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *   Red Hat, Inc. - initial API and implementation
+ */
+
+export class Disposable {
+    private disposable: undefined | (() => void);
+
+    constructor(func: () => void) {
+        this.disposable = func;
+    }
+    /**
+     * Dispose this object.
+     */
+    dispose(): void {
+        if (this.disposable) {
+            this.disposable();
+            this.disposable = undefined;
+        }
+    }
+
+    static create(func: () => void): Disposable {
+        return new Disposable(func);
+    }
+}
diff --git a/packages/isolated-extension-api/src/theia.d.ts b/packages/isolated-extension-api/src/theia.d.ts
index 06725d37083dd..f2b9510c66027 100644
--- a/packages/isolated-extension-api/src/theia.d.ts
+++ b/packages/isolated-extension-api/src/theia.d.ts
@@ -8,9 +8,21 @@
  * Contributors:
  *   Red Hat, Inc. - initial API and implementation
  */
-//import { Disposable } from '@theia/core/lib/common/disposable';
 
 declare module 'theia' {
+
+    export class Disposable {
+
+        constructor(func: () => void);
+        /**
+         * Dispose this object.
+         */
+        dispose(): void;
+
+        static create(func: () => void): Disposable;
+
+    }
+
     /**
      * A command is a unique identifier of a function
      * which can be executed by a user via a keyboard shortcut,