diff --git a/src/lib/bottom-sheet/bottom-sheet.spec.ts b/src/lib/bottom-sheet/bottom-sheet.spec.ts
index 4d3f076a8ff..b063cc0ad98 100644
--- a/src/lib/bottom-sheet/bottom-sheet.spec.ts
+++ b/src/lib/bottom-sheet/bottom-sheet.spec.ts
@@ -669,7 +669,7 @@ describe('MatBottomSheet with default options', () => {
     dispatchKeyboardEvent(document.body, 'keydown', ESCAPE);
 
     expect(overlayContainerElement.querySelector('mat-bottom-sheet-container')).toBeTruthy();
-    expect(document.activeElement.tagName).not.toBe('INPUT');
+    expect(document.activeElement!.tagName).not.toBe('INPUT');
   });
 
   it('should be overridable by open() options', fakeAsync(() => {