diff --git a/acme.sh b/acme.sh
index 4b80c120..c778e2e9 100755
--- a/acme.sh
+++ b/acme.sh
@@ -1787,7 +1787,7 @@ _send_signed_request() {
       if [ "$url" = "$ACME_NEW_ACCOUNT" ] || [ "$url" = "$ACME_REVOKE_CERT" ]; then
         protected="$JWK_HEADERPLACE_PART1$nonce\", \"url\": \"${url}$JWK_HEADERPLACE_PART2, \"jwk\": $jwk"'}'
       else
-        protected="$JWK_HEADERPLACE_PART1$nonce\", \"url\": \"${url}$JWK_HEADERPLACE_PART2, \"kid\": \"$ACCOUNT_URL\""'}'
+        protected="$JWK_HEADERPLACE_PART1$nonce\", \"url\": \"${url}$JWK_HEADERPLACE_PART2, \"kid\": \"${ACCOUNT_URL}\""'}'
       fi
     else
       protected="$JWK_HEADERPLACE_PART1$nonce\", \"url\": \"${url}$JWK_HEADERPLACE_PART2, \"jwk\": $jwk"'}'