diff --git a/packages/block-library/src/footnotes/index.php b/packages/block-library/src/footnotes/index.php
index 712cd571c8b0e9..bd7734d7d02d15 100644
--- a/packages/block-library/src/footnotes/index.php
+++ b/packages/block-library/src/footnotes/index.php
@@ -211,7 +211,7 @@ function wp_add_footnotes_to_revision( $fields ) {
 function wp_get_footnotes_from_revision( $revision_field, $field, $revision ) {
 	return get_metadata( 'post', $revision->ID, $field, true );
 }
-add_filter( 'wp_post_revision_field_footnotes', 'wp_get_footnotes_from_revision', 10, 3 );
+add_filter( '_wp_post_revision_field_footnotes', 'wp_get_footnotes_from_revision', 10, 3 );
 
 /**
  * The REST API autosave endpoint doesn't save meta, so we can use the