--- a/dav/config.c	Tue Sep 05 12:00:49 2017 +0200
+++ b/dav/config.c	Tue Sep 05 12:11:09 2017 +0200
@@ -253,6 +253,11 @@
             repo->ssl_version = CURL_SSLVERSION_TLSv1_2;
         }
 #endif
+#if LIBCURL_VERSION_MINOR >= 52
+        else if(xstrEQ(value, "TLSv1.3")) {
+            repo->ssl_version = CURL_SSLVERSION_TLSv1_3;
+        }
+#endif
 #endif
         else {
             print_warning(lineno, "unknown ssl version: %s\n", value);