Index: src/wp-includes/class-wp-editor.php
===================================================================
--- src/wp-includes/class-wp-editor.php	(revision 30358)
+++ src/wp-includes/class-wp-editor.php	(working copy)
@@ -484,6 +484,16 @@
 						],
 						strikethrough: {inline: 'del'}
 					}",
+					'block_formats' => (
+						'Paragraph=p;' .
+						'Pre=pre;' .
+						'Heading 1=h1;' .
+						'Heading 2=h2;' .
+						'Heading 3=h3;' .
+						'Heading 4=h4;' .
+						'Heading 5=h5;' .
+						'Heading 6=h6'
+					),
 					'relative_urls' => false,
 					'remove_script_host' => false,
 					'convert_urls' => false,