diff --git a/packages/block-library/src/heading/index.js b/packages/block-library/src/heading/index.js
index 4dd14230ae6b80..2b9eac45e956d7 100644
--- a/packages/block-library/src/heading/index.js
+++ b/packages/block-library/src/heading/index.js
@@ -36,6 +36,7 @@ export const settings = {
 		lightBlockWrapper: true,
 		__experimentalColor: true,
 		__experimentalLineHeight: true,
+		__experimentalFontSize: true,
 	},
 	example: {
 		attributes: {