Index: wp-includes/ms-load.php
===================================================================
--- wp-includes/ms-load.php	(revision 35724)
+++ wp-includes/ms-load.php	(working copy)
@@ -191,7 +191,9 @@
 		array_pop( $path_segments );
 	}
 
-	$paths[] = '/';
+	if( empty( $paths ) ) {
+		$paths[] = '/';
+	}
 
 	/**
 	 * Determine a site by its domain and path.