diff --git a/acme.sh b/acme.sh
index 28c39db4..eb13f652 100755
--- a/acme.sh
+++ b/acme.sh
@@ -1014,8 +1014,32 @@ _sign() {
     fi
     _debug3 "_signedECText" "$_signedECText"
     _ec_r="$(echo "$_signedECText" | _head_n 2 | _tail_n 1 | cut -d : -f 4 | tr -d "\r\n")"
-    _debug3 "_ec_r" "$_ec_r"
     _ec_s="$(echo "$_signedECText" | _head_n 3 | _tail_n 1 | cut -d : -f 4 | tr -d "\r\n")"
+    if [ "$__ECC_KEY_LEN" -eq "256" ]; then
+      while [ "${#_ec_r}" -lt "64" ]; do
+         _ec_r="0${_ec_r}"
+      done    
+      while [ "${#_ec_s}" -lt "64" ]; do
+         _ec_s="0${_ec_s}"
+      done
+    fi
+    if [ "$__ECC_KEY_LEN" -eq "384" ]; then
+      while [ "${#_ec_r}" -lt "96" ]; do
+         _ec_r="0${_ec_r}"
+      done    
+      while [ "${#_ec_s}" -lt "96" ]; do
+         _ec_s="0${_ec_s}"
+      done
+    fi
+    if [ "$__ECC_KEY_LEN" -eq "512" ]; then
+      while [ "${#_ec_r}" -lt "132" ]; do
+         _ec_r="0${_ec_r}"
+      done    
+      while [ "${#_ec_s}" -lt "132" ]; do
+         _ec_s="0${_ec_s}"
+      done
+    fi
+    _debug3 "_ec_r" "$_ec_r"    
     _debug3 "_ec_s" "$_ec_s"
     printf "%s" "$_ec_r$_ec_s" | _h2b | _base64
   else