Index: wp-admin/includes/class-wp-list-table.php
===================================================================
--- wp-admin/includes/class-wp-list-table.php	(revision 17148)
+++ wp-admin/includes/class-wp-list-table.php	(working copy)
@@ -197,7 +197,7 @@
 <p class="search-box">
 	<label class="screen-reader-text" for="<?php echo $input_id ?>"><?php echo $text; ?>:</label>
 	<input type="text" id="<?php echo $input_id ?>" name="s" value="<?php _admin_search_query(); ?>" />
-	<?php submit_button( $text, 'button', 'submit', false ); ?>
+	<?php submit_button( $text, 'button', 'submit', false, array('id' => 'search-submit') ); ?>
 </p>
 <img src="<?php echo esc_url( admin_url( 'images/wpspin_light.gif' ) ); ?>" class="ajax-loading list-ajax-loading" alt="" />
 <?php