diff --git a/nixos/hosts/steamdeck/disks.nix b/nixos/hosts/steamdeck/disks.nix
index 5e45bfc1..8c207fd2 100644
--- a/nixos/hosts/steamdeck/disks.nix
+++ b/nixos/hosts/steamdeck/disks.nix
@@ -60,7 +60,7 @@
               type = "btrfs";
               extraArgs = [ "-f" ];
               mountpoint = "/sdcard";
-              mountOptions = [ "compress=zstd" "noatime" ];
+              mountOptions = [ "compress=zstd" "noatime" "umask=7777"];
             }; # content
           }; # partition 2 (SD_CARD BTRFS)
         }; # partitions