diff --git a/packages/edit-site/src/components/global-styles/screen-root.js b/packages/edit-site/src/components/global-styles/screen-root.js
index 8cd26b4ba95ea..88333687efb23 100644
--- a/packages/edit-site/src/components/global-styles/screen-root.js
+++ b/packages/edit-site/src/components/global-styles/screen-root.js
@@ -40,7 +40,8 @@ function ScreenRoot() {
 
 		return {
 			variations: __experimentalGetCurrentThemeGlobalStylesVariations(),
-			canEditCSS: globalStyles?._links?.[ 'wp:action-edit-css' ] ?? false,
+			canEditCSS:
+				!! globalStyles?._links?.[ 'wp:action-edit-css' ] ?? false,
 		};
 	}, [] );