Index: wp-admin/includes/class-wp-upgrader.php
===================================================================
--- wp-admin/includes/class-wp-upgrader.php	(revision 11130)
+++ wp-admin/includes/class-wp-upgrader.php	(working copy)
@@ -941,7 +941,7 @@
 							);
 
 		if ( $this->type == 'web' )
-			$install_actions['themes_page'] = '<a href="' . admin_url('theme-install.php') . '" title="' . attr(__('Back to Theme Installer')) . '" target="_parent">' . __('Return to Theme Installer.') . '</a>';
+			$install_actions['themes_page'] = '<a href="' . admin_url('theme-install.php') . '" title="' . attr(__('Return to Theme Installer')) . '" target="_parent">' . __('Return to Theme Installer.') . '</a>';
 		else
 			$install_actions['themes_page'] = '<a href="' . admin_url('themes.php') . '" title="' . attr(__('Themes page')) . '" target="_parent">' . __('Return to Themes page') . '</a>';