diff --git a/pkgs/applications/networking/irc/communi/default.nix b/pkgs/applications/networking/irc/communi/default.nix
index 25e5a61f2722..917de745d277 100644
--- a/pkgs/applications/networking/irc/communi/default.nix
+++ b/pkgs/applications/networking/irc/communi/default.nix
@@ -29,7 +29,7 @@ stdenv.mkDerivation rec {
     "
   '';
 
-  postInstall = ''
+  postInstall = stdenv.lib.optionalString stdenv.isLinux ''
     substituteInPlace "$out/share/applications/communi.desktop" \
       --replace "/usr/bin" "$out/bin"
   '';