diff --git a/acme.sh b/acme.sh
index e7a30d91..5e794a5a 100755
--- a/acme.sh
+++ b/acme.sh
@@ -124,21 +124,21 @@ if [ -t 1 ]; then
 fi
 
 __green() {
-  if [ "$__INTERACTIVE${ACME_NO_COLOR}" = "1" ]; then
+  if [ "$__INTERACTIVE${ACME_NO_COLOR}" = "1" -o "${ACME_FORCE_COLOR}" = "1" ]; then
     printf '\033[1;31;32m'
   fi
   printf -- "%b" "$1"
-  if [ "$__INTERACTIVE${ACME_NO_COLOR}" = "1" ]; then
+  if [ "$__INTERACTIVE${ACME_NO_COLOR}" = "1" -o "${ACME_FORCE_COLOR}" = "1" ]; then
     printf '\033[0m'
   fi
 }
 
 __red() {
-  if [ "$__INTERACTIVE${ACME_NO_COLOR}" = "1" ]; then
+  if [ "$__INTERACTIVE${ACME_NO_COLOR}" = "1" -o "${ACME_FORCE_COLOR}" = "1" ]; then
     printf '\033[1;31;40m'
   fi
   printf -- "%b" "$1"
-  if [ "$__INTERACTIVE${ACME_NO_COLOR}" = "1" ]; then
+  if [ "$__INTERACTIVE${ACME_NO_COLOR}" = "1" -o "${ACME_FORCE_COLOR}" = "1" ]; then
     printf '\033[0m'
   fi
 }
@@ -5501,6 +5501,7 @@ Parameters:
   --ca-path                         Specifies directory containing CA certificates in PEM format, used by wget or curl.
   --nocron                          Only valid for '--install' command, which means: do not install the default cron job. In this case, the certs will not be renewed automatically.
   --no-color                        Do not output color text.
+  --force-color                     Force output of color text. Useful for non-interactive use with the aha tool for HTML E-Mails.
   --ecc                             Specifies to use the ECC cert. Valid for '--install-cert', '--renew', '--revoke', '--toPkcs' and '--createCSR'
   --csr                             Specifies the input csr.
   --pre-hook                        Command to be run before obtaining any certificates.
@@ -5966,6 +5967,9 @@ _process() {
       --no-color)
         export ACME_NO_COLOR=1
         ;;
+      --force-color)
+        export ACME_FORCE_COLOR=1
+        ;;
       --ecc)
         _ecc="isEcc"
         ;;