diff --git a/plugins/check_curl.c b/plugins/check_curl.c
index f3cf7422..7f3bcdb1 100644
--- a/plugins/check_curl.c
+++ b/plugins/check_curl.c
@@ -2049,8 +2049,11 @@ check_curl_config_wrapper process_arguments(int argc, char **argv) {
 				result.config.curl_http_version = CURL_HTTP_VERSION_NONE;
 #endif /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 33, 0) */
 			} else if ((strcmp(optarg, "3") == 0)) {
-				// TODO find out which libcurl version starts supporting HTTP 3
+#if LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 66, 0)
 				result.config.curl_config.curl_http_version = CURL_HTTP_VERSION_3;
+#else
+				result.config.curl_http_version = CURL_HTTP_VERSION_NONE;
+#endif /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 66, 0) */
 			} else {
 				fprintf(stderr, "unknown http-version parameter: %s\n", optarg);
 				exit(STATE_WARNING);