diff --git a/tinymce-single/blocks/elements/headings/register.js b/tinymce-single/blocks/elements/headings/register.js
index 20b166c097d462..dc3a3caf680a78 100644
--- a/tinymce-single/blocks/elements/headings/register.js
+++ b/tinymce-single/blocks/elements/headings/register.js
@@ -33,8 +33,9 @@
 		type: 'text',
 		icon: 'gridicons-heading',
 		controls: getControls(),
-		insert: function() {
-
+		insert: function( block, editor ) {
+			// Maybe detect best heading based on document outline.
+			editor.formatter.apply( 'h1', block );
 		}
 	} );
 } )( window.wp );
diff --git a/tinymce-single/blocks/elements/paragraph/register.js b/tinymce-single/blocks/elements/paragraph/register.js
index b346a55f14dfb9..990baac095f0f2 100644
--- a/tinymce-single/blocks/elements/paragraph/register.js
+++ b/tinymce-single/blocks/elements/paragraph/register.js
@@ -34,6 +34,6 @@ window.wp.blocks.registerBlock( {
 		'text-align-right'
 	],
 	insert: function( block, editor ) {
-		editor.formatter.apply( 'paragraph', block );
+		editor.formatter.apply( 'p', block );
 	}
 } );