diff --git a/spcd/bootstrap.sh b/spcd/bootstrap.sh
index 7f37345..39b2f1b 100644
--- a/spcd/bootstrap.sh
+++ b/spcd/bootstrap.sh
@@ -1112,30 +1112,31 @@ spcd_step__ca_install_package() {
 
 spcd_step__ca_write_certificates() {
     spcd_step "Write certificates"
+    local root index text path
     case "${SPCD_OS_ID}" in
     "${SPCD_OS_ALMA}" | "${SPCD_OS_FEDORA}" | "${SPCD_OS_ROCKY}")
-        spcd_wcc__root="/etc/pki/ca-trust/source/anchors"
+        root="/etc/pki/ca-trust/source/anchors"
         ;;
     "${SPCD_OS_ALPINE}" | "${SPCD_OS_DEBIAN}" | "${SPCD_OS_UBUNTU}")
-        spcd_wcc__root="/usr/local/share/ca-certificates"
+        root="/usr/local/share/ca-certificates"
         ;;
     "${SPCD_OS_ARCH}")
-        spcd_wcc__root="/etc/ca-certificates/trust-source/anchors"
+        root="/etc/ca-certificates/trust-source/anchors"
         ;;
     "${SPCD_OS_OPENSUSE}")
-        spcd_wcc__root="/etc/pki/trust/anchors"
+        root="/etc/pki/trust/anchors"
         ;;
     *) ;;
     esac
-    spcd_os_mkdir "${spcd_wcc__root}"
+    spcd_os_mkdir "${root}"
     while true; do
-        spcd_wcc__index=$((spcd_wcc__index + 1))
-        eval "spcd_wcc__text=\"\${SPCD_CA_${spcd_wcc__index}}\""
-        [ -n "${spcd_wcc__text}" ] || break
-        spcd_wcc__path="${spcd_wcc__root}/${spcd_wcc__index}.crt"
+        index=$((index + 1))
+        eval "text=\"\${SPCD_CA_${index}}\""
+        [ -n "${text}" ] || break
+        path="${root}/${index}.crt"
         spcd_split
-        spcd_os_write "${spcd_wcc__path}" "${spcd_wcc__text}"
-        spcd_openssl_x509 "${spcd_wcc__path}"
+        spcd_os_write "${path}" "${text}"
+        spcd_openssl_x509 "${path}"
     done
 }