diff --git a/src/main/resources/serviceconfig/olat.properties b/src/main/resources/serviceconfig/olat.properties
index 16de07684e3316c45917b1b25052bf0d459970b9..34b5daa69ca52fa2891b760541e0369041e64c7d 100644
--- a/src/main/resources/serviceconfig/olat.properties
+++ b/src/main/resources/serviceconfig/olat.properties
@@ -564,7 +564,7 @@ webdav.termsfolders.enabled=true
 # User agents for which the basic authentication should never be proposed
 webdav.basic.authentication.black.list=Microsoft Office Excel,Microsoft Excel,Microsoft-WebDAV-MiniRedir
 # User agents which don't play nice
-webdav.user.agent.black.list=-
+webdav.user.agent.black.list=,-
 
 ########################################################################
 # Image and PDF scale/thumbnail options