Index: wp-admin/edit-form-advanced.php
===================================================================
--- wp-admin/edit-form-advanced.php	(revision 26908)
+++ wp-admin/edit-form-advanced.php	(working copy)
@@ -125,7 +125,7 @@
 	$revisions = wp_get_post_revisions( $post_ID );
 
 	// We should aim to show the revisions metabox only when there are revisions.
-	if ( count( $revisions ) > 1 ) {
+	if ( count( $revisions ) ) {
 		reset( $revisions ); // Reset pointer for key()
 		$publish_callback_args = array( 'revisions_count' => count( $revisions ), 'revision_id' => key( $revisions ) );
 		add_meta_box('revisionsdiv', __('Revisions'), 'post_revisions_meta_box', null, 'normal', 'core');