diff --git a/wp-admin/themes.php b/wp-admin/themes.php
index ca28550909..1b245c4ef2 100644
--- a/wp-admin/themes.php
+++ b/wp-admin/themes.php
@@ -148,7 +148,7 @@ function theme_update_available( $theme ) {
 
 		if ( ! current_user_can('update_themes') )
 			printf( '<p><strong>' . __('There is a new version of %1$s available. <a href="%2$s" class="thickbox" title="%1$s">View version %3$s Details</a>.') . '</strong></p>', $theme_name, $details_url, $update['new_version']);
-		else if ( empty($update->package) )
+		else if ( empty($update['package']) )
 			printf( '<p><strong>' . __('There is a new version of %1$s available. <a href="%2$s" class="thickbox" title="%1$s">View version %3$s Details</a> <em>automatic upgrade unavailable for this theme</em>.') . '</strong></p>', $theme_name, $details_url, $update['new_version']);
 		else
 			printf( '<p><strong>' . __('There is a new version of %1$s available. <a href="%2$s" class="thickbox" title="%1$s">View version %3$s Details</a> or <a href="%4$s" %5$s >upgrade automatically</a>.') . '</strong></p>', $theme_name, $details_url, $update['new_version'], $update_url, $update_onclick );