diff --git a/ucb/source/ucp/webdav-curl/CurlSession.cxx b/ucb/source/ucp/webdav-curl/CurlSession.cxx
index 79574118d210..c3c873072ae1 100644
--- a/ucb/source/ucp/webdav-curl/CurlSession.cxx
+++ b/ucb/source/ucp/webdav-curl/CurlSession.cxx
@@ -618,9 +618,10 @@ CurlSession::CurlSession(uno::Reference<uno::XComponentContext> const& xContext,
     // en.wikipedia.org:80 forces back 403 "Scripts should use an informative
     // User-Agent string with contact information, or they may be IP-blocked
     // without notice" otherwise:
-    OString const useragent(OString::Concat("LibreOffice " LIBO_VERSION_DOTTED " curl/")
-                            + ::std::string_view(pVersion->version, strlen(pVersion->version)) + " "
-                            + pVersion->ssl_version);
+    OString const useragent(
+        OString::Concat("LibreOffice " LIBO_VERSION_DOTTED " denylistedbackend/")
+        + ::std::string_view(pVersion->version, strlen(pVersion->version)) + " "
+        + pVersion->ssl_version);
     // looks like an explicit "User-Agent" header in CURLOPT_HTTPHEADER
     // will override CURLOPT_USERAGENT, see Curl_http_useragent(), so no need
     // to check anything here