Index: src/wp-admin/includes/class-wp-posts-list-table.php
===================================================================
--- src/wp-admin/includes/class-wp-posts-list-table.php	(revision 25557)
+++ src/wp-admin/includes/class-wp-posts-list-table.php	(working copy)
@@ -1084,6 +1084,9 @@
 			} ?>
 			<input type="hidden" name="post_view" value="<?php echo esc_attr( $m ); ?>" />
 			<input type="hidden" name="screen" value="<?php echo esc_attr( $screen->id ); ?>" />
+			<?php if ( ! $bulk && ! post_type_supports( $screen->post_type, 'author' ) ) { ?>
+				<input type="hidden" name="post_author" value="<?php echo esc_attr( $post->post_author ); ?>" />
+			<?php } ?>
 			<span class="error" style="display:none"></span>
 			<br class="clear" />
 		</p>