diff --git a/packages/block-editor/src/components/global-styles/use-global-styles-output.js b/packages/block-editor/src/components/global-styles/use-global-styles-output.js
index 7bdc95d222142d..fabc65d143d1aa 100644
--- a/packages/block-editor/src/components/global-styles/use-global-styles-output.js
+++ b/packages/block-editor/src/components/global-styles/use-global-styles-output.js
@@ -624,7 +624,7 @@ function pickStyleKeys( treeToPickFrom ) {
 	// clone the style objects so that `getFeatureDeclarations` can remove consumed keys from it
 	const clonedEntries = pickedEntries.map( ( [ key, style ] ) => [
 		key,
-		JSON.parse( JSON.stringify( style ) ),
+		structuredClone( style ),
 	] );
 	return Object.fromEntries( clonedEntries );
 }
diff --git a/packages/block-editor/src/hooks/style.js b/packages/block-editor/src/hooks/style.js
index db2acd01665b60..5be2b1b3fd40a8 100644
--- a/packages/block-editor/src/hooks/style.js
+++ b/packages/block-editor/src/hooks/style.js
@@ -245,7 +245,7 @@ export function omitStyle( style, paths, preserveReference = false ) {
 
 	let newStyle = style;
 	if ( ! preserveReference ) {
-		newStyle = JSON.parse( JSON.stringify( style ) );
+		newStyle = structuredClone( style );
 	}
 
 	if ( ! Array.isArray( paths ) ) {