diff --git a/packages/edit-widgets/src/store/actions.js b/packages/edit-widgets/src/store/actions.js
index d5f8d52a1346af..8124ace66bdb3a 100644
--- a/packages/edit-widgets/src/store/actions.js
+++ b/packages/edit-widgets/src/store/actions.js
@@ -395,7 +395,7 @@ export const moveBlockToWidgetArea =
 	async ( { dispatch, select, registry } ) => {
 		const sourceRootClientId = registry
 			.select( blockEditorStore )
-			.getBlockRootClientId( [ clientId ] );
+			.getBlockRootClientId( clientId );
 
 		// Search the top level blocks (widget areas) for the one with the matching
 		// id attribute. Makes the assumption that all top-level blocks are widget