diff --git a/pkgs/tools/audio/mididings/default.nix b/pkgs/tools/audio/mididings/default.nix
index 35d1af1e767..addb95b9f1b 100644
--- a/pkgs/tools/audio/mididings/default.nix
+++ b/pkgs/tools/audio/mididings/default.nix
@@ -1,7 +1,7 @@
 { stdenv, pythonPackages, fetchFromGitHub, pkg-config, glib, alsaLib, libjack2  }:
 
 pythonPackages.buildPythonApplication {
-  version = "20151117";
+  version = "2015-11-17";
   pname = "mididings";
 
   src = fetchFromGitHub {