diff --git a/wp-admin/includes/class-wp-ms-themes-list-table.php b/wp-admin/includes/class-wp-ms-themes-list-table.php
index e0f3378626..1cb9d61ac7 100644
--- a/wp-admin/includes/class-wp-ms-themes-list-table.php
+++ b/wp-admin/includes/class-wp-ms-themes-list-table.php
@@ -284,7 +284,7 @@ class WP_MS_Themes_List_Table extends WP_List_Table {
 			$actions['disable'] = '<a href="' . esc_url( wp_nonce_url($url . 'action=disable&amp;theme=' . $theme_key . '&amp;paged=' . $page . '&amp;s=' . $s, 'disable-theme_' . $theme_key) ) . '" title="' . esc_attr__('Disable this theme') . '">' . ( $this->is_site_themes ? __( 'Disable' ) : __( 'Network Disable' ) ) . '</a>';
 
 		if ( current_user_can('edit_themes') )
-			$actions['edit'] = '<a href="' . esc_url('theme-editor.php?theme=' . $theme['Name'] ) . '" title="' . esc_attr__('Open this theme in the Theme Editor') . '" class="edit">' . __('Edit') . '</a>';
+			$actions['edit'] = '<a href="' . esc_url('theme-editor.php?theme=' . urlencode( $theme['Name'] )) . '" title="' . esc_attr__('Open this theme in the Theme Editor') . '" class="edit">' . __('Edit') . '</a>';
 
 		if ( empty( $theme['enabled'] ) && current_user_can( 'delete_themes' ) && ! $this->is_site_themes && $theme_key != get_option( 'stylesheet' ) && $theme_key != get_option( 'template' ) )
 			$actions['delete'] = '<a href="' . esc_url( wp_nonce_url( 'themes.php?action=delete-selected&amp;checked[]=' . $theme_key . '&amp;theme_status=' . $context . '&amp;paged=' . $page . '&amp;s=' . $s, 'bulk-themes' ) ) . '" title="' . esc_attr__( 'Delete this theme' ) . '" class="delete">' . __( 'Delete' ) . '</a>';