diff --git a/lass/2configs/prism-share.nix b/lass/2configs/prism-share.nix
index 70e616ec6..aa3eb541d 100644
--- a/lass/2configs/prism-share.nix
+++ b/lass/2configs/prism-share.nix
@@ -21,7 +21,7 @@ with import <stockholm/lib>;
     shares = {
       incoming = {
         path = "/mnt/prism";
-        "read only" = "no";
+        "read only" = "yes";
         browseable = "yes";
         "guest ok" = "yes";
       };