diff --git a/pkgs/shells/fish/default.nix b/pkgs/shells/fish/default.nix
index 5bb7100a620f..8916cca0f044 100644
--- a/pkgs/shells/fish/default.nix
+++ b/pkgs/shells/fish/default.nix
@@ -24,6 +24,7 @@ stdenv.mkDerivation rec {
     sed -e "s|expr|${coreutils}/bin/expr|" \
   '' + stdenv.lib.optionalString (!stdenv.isDarwin) ''
         -e "s|if which unicode_start|if true|" \
+    '' + stdenv.lib.optionalString stdenv.isLinux ''
         -e "s|unicode_start|${kbd}/bin/unicode_start|" \
   '' + ''
         -i "$out/etc/fish/config.fish"