diff --git a/wp-includes/media.php b/wp-includes/media.php
index 4dfefd4398..c4c8961b9f 100644
--- a/wp-includes/media.php
+++ b/wp-includes/media.php
@@ -2778,8 +2778,16 @@ function wp_prepare_attachment_for_js( $attachment ) {
 	}
 
 	$attached_file = get_attached_file( $attachment->ID );
-	if ( file_exists( $attached_file ) ) {
+	
+	if ( isset( $meta['filesize'] ) ) {
+		$bytes = $meta['filesize'];
+	} elseif ( file_exists( $attached_file ) ) {
 		$bytes = filesize( $attached_file );
+	} else {
+		$bytes = '';
+	}
+
+	if ( $bytes ) {
 		$response['filesizeInBytes'] = $bytes;
 		$response['filesizeHumanReadable'] = size_format( $bytes );
 	}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index c820deef89..9a8029bb00 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-34257';
+$wp_version = '4.4-alpha-34258';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.