diff --git a/cd.sh b/cd.sh
index b12c1e7..fe65ea1 100644
--- a/cd.sh
+++ b/cd.sh
@@ -480,20 +480,22 @@ cd_install_ca_certificates () {
 }
 
 cd_write_ca_certificates () {
-local index
-local path
-local text
     cd_step "Write CA certificates"
     cd_mkdir "${CD_CA_ROOT}"
-    index=1
-    eval "text=\"\${CD_CA_${index}}\""
-    while [ "${text}" ] ; do
-        path="${CD_CA_ROOT}/${index}.crt"
+    cd_write_ca_certificates__index=1
+    eval "cd_write_ca_certificates__text=\
+\"\${CD_CA_${cd_write_ca_certificates__index}}\""
+    while [ "${cd_write_ca_certificates__text}" ] ; do
+        cd_write_ca_certificates__path="\
+${CD_CA_ROOT}/${cd_write_ca_certificates__index}.crt"
         cd_split
-        cd_write "${path}" "${text}"
-        cd_openssl "${path}"
-        index=$((index+1))
-        eval "text=\"\${CD_CA_${index}}\""
+        cd_write \
+        "${cd_write_ca_certificates__path}" \
+        "${cd_write_ca_certificates__text}"
+        cd_openssl "${cd_write_ca_certificates__path}"
+        cd_write_ca_certificates__index=$((cd_write_ca_certificates__index+1))
+        eval "cd_write_ca_certificates__text=\
+\"\${CD_CA_${cd_write_ca_certificates__index}}\""
     done
 }