diff --git a/pkgs/by-name/fl/fluxcd/update.sh b/pkgs/by-name/fl/fluxcd/update.sh
index d81089203867..c8cc8901b9f1 100755
--- a/pkgs/by-name/fl/fluxcd/update.sh
+++ b/pkgs/by-name/fl/fluxcd/update.sh
@@ -8,30 +8,30 @@ FLUXCD_PATH="$( cd -- "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"
 
 OLD_VERSION="$(nix-instantiate --eval -E "with import $NIXPKGS_PATH {}; fluxcd.version or (builtins.parseDrvName fluxcd.name).version" | tr -d '"')"
 LATEST_TAG=$(curl ${GITHUB_TOKEN:+" -u \":$GITHUB_TOKEN\""} --silent https://api.github.com/repos/fluxcd/flux2/releases/latest | jq -r '.tag_name')
-LATEST_VERSION=$(echo ${LATEST_TAG} | sed 's/^v//')
+LATEST_VERSION=$(echo "${LATEST_TAG}" | sed 's/^v//')
 
 if [ ! "$OLD_VERSION" = "$LATEST_VERSION" ]; then
-    SHA256=$(nix-prefetch-url --quiet --unpack https://github.com/fluxcd/flux2/archive/refs/tags/${LATEST_TAG}.tar.gz)
-    SHA256=$(nix hash convert --hash-algo sha256 --to sri $SHA256)
-    SPEC_SHA256=$(nix-prefetch-url --quiet --unpack https://github.com/fluxcd/flux2/releases/download/${LATEST_TAG}/manifests.tar.gz)
-    SPEC_SHA256=$(nix hash convert --hash-algo sha256 --to sri $SPEC_SHA256)
+    SHA256=$(nix-prefetch-url --quiet --unpack "https://github.com/fluxcd/flux2/archive/refs/tags/${LATEST_TAG}.tar.gz")
+    SHA256=$(nix hash convert --hash-algo sha256 --to sri "$SHA256")
+    SPEC_SHA256=$(nix-prefetch-url --quiet --unpack "https://github.com/fluxcd/flux2/releases/download/${LATEST_TAG}/manifests.tar.gz")
+    SPEC_SHA256=$(nix hash convert --hash-algo sha256 --to sri "$SPEC_SHA256")
 
     setKV () {
         sed -i "s|$1 = \".*\"|$1 = \"${2:-}\"|" "${FLUXCD_PATH}/package.nix"
     }
 
-    setKV version ${LATEST_VERSION}
-    setKV sha256 ${SHA256}
-    setKV manifestsSha256 ${SPEC_SHA256}
+    setKV version "${LATEST_VERSION}"
+    setKV sha256 "${SHA256}"
+    setKV manifestsSha256 "${SPEC_SHA256}"
     setKV vendorHash "sha256-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=" # The same as lib.fakeHash
 
     set +e
-    VENDOR_HASH=$(nix-build --no-out-link -A fluxcd $NIXPKGS_PATH 2>&1 >/dev/null | grep "got:" | cut -d':' -f2 | sed 's| ||g')
-    VENDOR_HASH=$(nix hash convert --hash-algo sha256 --to sri $VENDOR_HASH)
+    VENDOR_HASH=$(nix-build --no-out-link -A fluxcd "$NIXPKGS_PATH" 2>&1 >/dev/null | grep "got:" | cut -d':' -f2 | sed 's| ||g')
+    VENDOR_HASH=$(nix hash convert --hash-algo sha256 --to sri "$VENDOR_HASH")
     set -e
 
     if [ -n "${VENDOR_HASH:-}" ]; then
-        setKV vendorHash ${VENDOR_HASH}
+        setKV vendorHash "${VENDOR_HASH}"
     else
         echo "Update failed. VENDOR_HASH is empty."
         exit 1