diff --git a/lib/testing/src/lib/protractor/core/pages/material/material-locators.ts b/lib/testing/src/lib/protractor/core/pages/material/material-locators.ts
index 22bfcda2d4..67c1cf0579 100644
--- a/lib/testing/src/lib/protractor/core/pages/material/material-locators.ts
+++ b/lib/testing/src/lib/protractor/core/pages/material/material-locators.ts
@@ -181,7 +181,7 @@ export const materialLocators = {
     root: 'mat-error'
   },
   Expanded: {
-    class: '.mat-mdc-expanded',
+    class: '.mat-expanded',
     root: 'mat-expanded'
   },
   Expansion: {