diff --git a/packages/edit-post/src/components/header/header-toolbar/index.js b/packages/edit-post/src/components/header/header-toolbar/index.js
index bcb81804272916..4e56e7ad8a9902 100644
--- a/packages/edit-post/src/components/header/header-toolbar/index.js
+++ b/packages/edit-post/src/components/header/header-toolbar/index.js
@@ -107,6 +107,7 @@ function HeaderToolbar() {
 				shortcut={ listViewShortcut }
 				showTooltip={ ! showIconLabels }
 				variant={ showIconLabels ? 'tertiary' : undefined }
+				aria-expanded={ isListViewOpen }
 			/>
 		</>
 	);
diff --git a/packages/edit-site/src/components/header-edit-mode/index.js b/packages/edit-site/src/components/header-edit-mode/index.js
index 6cff62b94c51e3..63e0c2871f21e4 100644
--- a/packages/edit-site/src/components/header-edit-mode/index.js
+++ b/packages/edit-site/src/components/header-edit-mode/index.js
@@ -265,6 +265,7 @@ export default function HeaderEditMode() {
 												? 'tertiary'
 												: undefined
 										}
+										aria-expanded={ isListViewOpen }
 									/>
 								) }
 								{ isZoomedOutViewExperimentEnabled &&