diff --git a/backends/arm/scripts/utils.sh b/backends/arm/scripts/utils.sh
index 8f685b3dc22..c5a467f057b 100644
--- a/backends/arm/scripts/utils.sh
+++ b/backends/arm/scripts/utils.sh
@@ -93,7 +93,7 @@ function download_with_retry() {
     for attempt in $(seq 1 ${max_attempts}); do
         rm -f "${output}"
         if curl --fail --retry 3 --retry-delay 5 --retry-connrefused --retry-all-errors \
-             "${ARM_SETUP_CURL_PROGRESS_ARGS[@]}" -L --output "${output}" "${url}" \
+             ${ARM_SETUP_CURL_PROGRESS_ARGS[@]+"${ARM_SETUP_CURL_PROGRESS_ARGS[@]}"} -L --output "${output}" "${url}" \
            && verify_md5 "${expected_md5}" "${output}"; then
             return 0
         fi
diff --git a/backends/arm/scripts/vulkan_utils.sh b/backends/arm/scripts/vulkan_utils.sh
index 7418e86fcfb..f5b6abc4ff2 100644
--- a/backends/arm/scripts/vulkan_utils.sh
+++ b/backends/arm/scripts/vulkan_utils.sh
@@ -53,7 +53,7 @@ function download_and_extract_vulkan_sdk_linux() {
 
     if [[ ! -e "${vulkan_sdk_tar_file}" ]]; then
         log_step "vulkan" "Downloading Vulkan SDK (${vulkan_sdk_version})"
-        curl "${ARM_SETUP_CURL_PROGRESS_ARGS[@]}" -L --output "${vulkan_sdk_tar_file}" "${vulkan_sdk_url}"
+        curl ${ARM_SETUP_CURL_PROGRESS_ARGS[@]+"${ARM_SETUP_CURL_PROGRESS_ARGS[@]}"} -L --output "${vulkan_sdk_tar_file}" "${vulkan_sdk_url}"
         echo "${vulkan_sdk_sha256} ${vulkan_sdk_tar_file}" | sha256sum -c - || exit 1
         rm -fr ${vulkan_sdk_base_dir}
     fi
@@ -67,7 +67,7 @@ function install_vulkan_sdk_macos() {
 
     if [[ ! -e "${vulkan_sdk_zip_file}" ]]; then
         log_step "vulkan" "Downloading Vulkan SDK (${vulkan_sdk_version}) for macOS"
-        curl "${ARM_SETUP_CURL_PROGRESS_ARGS[@]}" -L --output "${vulkan_sdk_zip_file}" "${vulkan_sdk_url}"
+        curl ${ARM_SETUP_CURL_PROGRESS_ARGS[@]+"${ARM_SETUP_CURL_PROGRESS_ARGS[@]}"} -L --output "${vulkan_sdk_zip_file}" "${vulkan_sdk_url}"
         echo "${vulkan_sdk_sha256}  ${vulkan_sdk_zip_file}" | shasum -a 256 -c - || exit 1
         rm -fr ${vulkan_sdk_base_dir}
     fi