diff --git a/pkgs/by-name/fl/fladder/update.sh b/pkgs/by-name/fl/fladder/update.sh
index e496a793a2d6..99db6d75c69e 100755
--- a/pkgs/by-name/fl/fladder/update.sh
+++ b/pkgs/by-name/fl/fladder/update.sh
@@ -3,7 +3,7 @@
 
 set -eou pipefail
 
-PACKAGE_DIR=$(realpath "$(dirname "$0")")
+PACKAGE_DIR="$(realpath "$(dirname "$0")")"
 cd "$PACKAGE_DIR"
 while ! test -f flake.nix; do cd ..; done
 NIXPKGS_DIR="$PWD"