diff --git a/wp-admin/includes/media.php b/wp-admin/includes/media.php
index aa3b82bba3..7662834046 100644
--- a/wp-admin/includes/media.php
+++ b/wp-admin/includes/media.php
@@ -378,7 +378,7 @@ function media_buttons($editor_id = 'content') {
 
 	$img = '<img src="' . esc_url( admin_url( 'images/media-button.png?ver=20111005' ) ) . '" width="15" height="15" />';
 
-	echo '<a href="' . esc_url( get_upload_iframe_src() ) . '" class="thickbox add_media" id="$editor_id-add_media" title="' . esc_attr__( 'Add Media' ) . '" onclick="return false;">' . sprintf( $context, $img ) . '</a>';
+	echo '<a href="' . esc_url( get_upload_iframe_src() ) . '" class="thickbox add_media" id="' . esc_attr( $editor_id ) . '-add_media" title="' . esc_attr__( 'Add Media' ) . '" onclick="return false;">' . sprintf( $context, $img ) . '</a>';
 }
 add_action( 'media_buttons', 'media_buttons' );