diff --git a/heimserver/configuration.nix b/heimserver/configuration.nix
index 104f68e..7a32556 100644
--- a/heimserver/configuration.nix
+++ b/heimserver/configuration.nix
@@ -347,6 +347,7 @@
         "--shm-size=512m"
         "--network=host"
         "--privileged"
+        "--mount=type=tmpfs,target=/tmp/cache,tmpfs-size=4000000000"
       ];
     };
     containers.netflow2ng = {