diff --git a/pkgs/development/compilers/dotnet/update.sh b/pkgs/development/compilers/dotnet/update.sh
index 8dd35a3bc0bb..46486f9e309a 100755
--- a/pkgs/development/compilers/dotnet/update.sh
+++ b/pkgs/development/compilers/dotnet/update.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env nix-shell
-#!nix-shell -I nixpkgs=./. -i bash -p curl jq nix gnused
+#!nix-shell -I nixpkgs=./. -i bash -p curl jq nix gnused nixfmt
 # shellcheck shell=bash
 
 set -Eeuo pipefail