diff --git a/extensions/vscode-api-tests/src/languages.test.ts b/extensions/vscode-api-tests/src/languages.test.ts
index 321b1b772f2..01dea3ddc3f 100644
--- a/extensions/vscode-api-tests/src/languages.test.ts
+++ b/extensions/vscode-api-tests/src/languages.test.ts
@@ -78,12 +78,12 @@ suite('languages namespace tests', () => {
 		});
 
 		return workspace.openTextDocument(uri).then(doc => {
-			return commands.executeCommand('vscode.executeCompletionItemProvider', uri, new Position(1, 0));
-		}).then((result: CompletionList) => {
+			return commands.executeCommand<CompletionList>('vscode.executeCompletionItemProvider', uri, new Position(1, 0));
+		}).then((result: CompletionList | undefined) => {
 			r1.dispose();
 			assert.ok(ran);
-			console.log(result.items);
-			assert.equal(result.items[0].label, 'foo');
+			console.log(result!.items);
+			assert.equal(result!.items[0].label, 'foo');
 		});
 	});
 });
diff --git a/extensions/vscode-api-tests/src/window.test.ts b/extensions/vscode-api-tests/src/window.test.ts
index c197808fd9e..2a2f92c90e7 100644
--- a/extensions/vscode-api-tests/src/window.test.ts
+++ b/extensions/vscode-api-tests/src/window.test.ts
@@ -350,7 +350,7 @@ suite('window namespace tests', () => {
 	});
 
 	test('showWorkspaceFolderPick', function () {
-		const p = (<any>window).showWorkspaceFolderPick(undefined);
+		const p = window.showWorkspaceFolderPick(undefined);
 
 		return commands.executeCommand('workbench.action.acceptSelectedQuickOpenItem').then(() => {
 			return p.then(workspace => {