diff --git a/pkgs/development/compilers/purescript/purescript/update.sh b/pkgs/development/compilers/purescript/purescript/update.sh
index de8787ba4cca..ea6663d810c4 100755
--- a/pkgs/development/compilers/purescript/purescript/update.sh
+++ b/pkgs/development/compilers/purescript/purescript/update.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env nix-shell
-#!nix-shell -i bash -p curl jq -I nixpkgs=.
+#!nix-shell -i bash -p curl gnused jq -I nixpkgs=.
 #
 # This script will update the purescript derivation to the latest version.