diff --git a/src/tsconfig.strictNullChecks.json b/src/tsconfig.strictNullChecks.json
index aadb38430382b000929f2308b38a340c8fdb5fc1..e2bb71d9801c4148ef23df1f3e2a43aaa87b8ef0 100644
--- a/src/tsconfig.strictNullChecks.json
+++ b/src/tsconfig.strictNullChecks.json
@@ -104,6 +104,7 @@
 		"./vs/base/test/browser/progressBar.test.ts",
 		"./vs/base/test/browser/ui/contextview/contextview.test.ts",
 		"./vs/base/test/browser/ui/grid/grid.test.ts",
+		"./vs/base/test/browser/ui/grid/gridview.test.ts",
 		"./vs/base/test/browser/ui/grid/util.ts",
 		"./vs/base/test/browser/ui/list/listView.test.ts",
 		"./vs/base/test/browser/ui/list/rangeMap.test.ts",
diff --git a/src/vs/base/test/browser/ui/grid/gridview.test.ts b/src/vs/base/test/browser/ui/grid/gridview.test.ts
index 3485fa63b3173c6bdac8e249457965008091f539..284042b3f249d8fef7d59a332df0e9fd3fc3be5a 100644
--- a/src/vs/base/test/browser/ui/grid/gridview.test.ts
+++ b/src/vs/base/test/browser/ui/grid/gridview.test.ts
@@ -22,7 +22,7 @@ suite('Gridview', function () {
 	});
 
 	teardown(function () {
-		gridview = null;
+		gridview = null!;
 	});
 
 	test('empty gridview is empty', function () {