diff --git a/flake.nix b/flake.nix
index 60bb224..5339e51 100644
--- a/flake.nix
+++ b/flake.nix
@@ -44,6 +44,7 @@
                 --socket="$MYSQL_UNIX_PORT" \
                 --pid-file="$MARIADB_HOME/mariadb.pid" \
                 --log-error="$MARIADB_HOME/mariadb.log" \
+                --tmpdir="$MARIADB_HOME/tmp" \
                 --bind-address=127.0.0.1 \
                 --port="$DB_PORT" \
                 < /dev/null > /dev/null 2>&1 &