diff --git a/pkgs/development/tools/misc/tcptrack/default.nix b/pkgs/development/tools/misc/tcptrack/default.nix
index d4691bc093a6..25121bf1ad7d 100644
--- a/pkgs/development/tools/misc/tcptrack/default.nix
+++ b/pkgs/development/tools/misc/tcptrack/default.nix
@@ -2,7 +2,7 @@
 
 stdenv.mkDerivation rec {
   pname = "tcptrack";
-  version = "1.4.3+unstable=2017-04-29";
+  version = "unstable-2017-04-29";
 
   src = fetchFromGitHub {
     owner = "bchretien";