diff --git a/pkgs/games/tennix/default.nix b/pkgs/games/tennix/default.nix
index bfcdb9c4c55d..e5b2b358f329 100644
--- a/pkgs/games/tennix/default.nix
+++ b/pkgs/games/tennix/default.nix
@@ -5,7 +5,7 @@ stdenv.mkDerivation rec {
   version = "1.3.1";
 
   src = fetchgit {
-    url = git://repo.or.cz/tennix.git;
+    url = "git://repo.or.cz/tennix.git";
     rev = "refs/tags/tennix-${version}";
     sha256 = "sha256-U5+S1jEeg+7gdM1++dln6ePTqxZu2Zt0oUrH3DIlkgk=";
   };