Index: wp-admin/includes/template.php
===================================================================
--- wp-admin/includes/template.php	(revision 21789)
+++ wp-admin/includes/template.php	(working copy)
@@ -1638,15 +1638,16 @@
  */
 function get_submit_button( $text = null, $type = 'primary', $name = 'submit', $wrap = true, $other_attributes = null ) {
 	if ( ! is_array( $type ) )
-		$type = explode( ' ', $type ); 
+		$type = explode( ' ', $type );
 
 	$button_shorthand = array( 'primary', 'tiny', 'small', 'large' );
-	$classes = array( 'button' );
+	$classes = array();
 	foreach ( $type as $t ) {
 		if ( 'secondary' === $t || 'button-secondary' === $t )
 			continue;
 		$classes[] = in_array( $t, $button_shorthand ) ? 'button-' . $t : $t;
 	}
+	$classes[] = 'button';
 	$class = implode( ' ', array_unique( $classes ) );
 
 	if ( 'delete' === $type )