diff --git a/packages/editor/src/components/post-card-panel/index.js b/packages/editor/src/components/post-card-panel/index.js
index f51a612572a1ea..5aebfb650bfdbc 100644
--- a/packages/editor/src/components/post-card-panel/index.js
+++ b/packages/editor/src/components/post-card-panel/index.js
@@ -93,7 +93,7 @@ export default function PostCardPanel( { actions } ) {
 					className="editor-post-card-panel__title"
 					weight={ 500 }
 					as="h2"
-					lineHeight={ '20px' }
+					lineHeight="20px"
 				>
 					{ title ? decodeEntities( title ) : __( 'No Title' ) }
 					{ isFrontPage && (