diff --git a/devshell/commands.nix b/devshell/commands.nix
index 7a261c6..b708660 100644
--- a/devshell/commands.nix
+++ b/devshell/commands.nix
@@ -52,7 +52,7 @@ in
       name = "json2nix";
       category = "utilities";
       help = "Convert JSON to formatted Nix";
-      command = "nix eval --impure --expr 'builtins.fromJSON (builtins.readFile /dev/stdin)' | ${pkgs.nixfmt}/bin/nixfmt";
+      command = "nix eval --impure --expr 'builtins.fromJSON (builtins.readFile /dev/stdin)' | ${pkgs.nixfmt}/bin/nixfmt -";
     }
 
     {