diff --git a/pkgs/tools/filesystems/9pfs/default.nix b/pkgs/tools/filesystems/9pfs/default.nix
index 5ad54adc08ad..37ec4105472b 100644
--- a/pkgs/tools/filesystems/9pfs/default.nix
+++ b/pkgs/tools/filesystems/9pfs/default.nix
@@ -1,7 +1,7 @@
 { lib, stdenv, fetchFromGitHub, fuse }:
 
 stdenv.mkDerivation rec {
-  name = "9pfs";
+  name = "9pfs-20150918";
 
   src = fetchFromGitHub {
     owner = "mischief";