diff --git a/acme.sh b/acme.sh
index a7ce9737..8c61f413 100755
--- a/acme.sh
+++ b/acme.sh
@@ -3102,7 +3102,7 @@ _process() {
         HTTPS_INSECURE="1"
         ;;
     --ca-bundle)
-        _ca_bundle="$2"
+        _ca_bundle=$(readlink -f $2)
         CA_BUNDLE="$_ca_bundle"
         shift
         ;;