diff --git a/nix/modules/fish/default.nix b/nix/modules/fish/default.nix
index 77c2b73..3ca7fb3 100644
--- a/nix/modules/fish/default.nix
+++ b/nix/modules/fish/default.nix
@@ -75,7 +75,7 @@ let tide_conf = builtins.readFile ./tide_config.fish; in
           set --prepend fish_complete_path "$KITTY_INSTALLATION_DIR/shell-integration/fish/vendor_completions.d"
       end
 
-      if test -d $HOME/.cargo/
+      if test -f $HOME/.cargo/env.fish
         source "$HOME/.cargo/env.fish"
       end