diff --git a/src/vs/workbench/api/common/extHostMemento.ts b/src/vs/workbench/api/common/extHostMemento.ts
index 076c79eab34db68b04c3f235967bca09272c5ba7..97e17b832e3d533f403e46c1813698b8a343fcf4 100644
--- a/src/vs/workbench/api/common/extHostMemento.ts
+++ b/src/vs/workbench/api/common/extHostMemento.ts
@@ -60,7 +60,7 @@ export class ExtensionMemento implements vscode.Memento {
 	}
 }
 
-export class ExtensionGlobalMemento extends ExtensionMemento implements vscode.SyncedMemento {
+export class ExtensionGlobalMemento extends ExtensionMemento {
 
 	private readonly _extension: IExtensionDescription;