diff --git a/flake.nix b/flake.nix
index fbe5989..b87449b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -76,10 +76,12 @@
           text = ''
             set -Eeuo pipefail
 
-            mkdir -p "''${YORE_DBMATE_DIR}/db"
-            cp -r ${./db}/* "''${YORE_DBMATE_DIR}/db"
-            cd "''${YORE_DBMATE_DIR}"
+            TMPDIR=$(mktemp -d "''${YORE_DBMATE_DIR}")
+            mkdir -p "''${TMPDIR}/db"
+            cp -r ${./db}/* "''${TMPDIR}/db"
+            cd "''${TMPDIR}"
             dbmate up
+            rm -rf "''${TMPDIR}"
 
             # Replace bash and inherit PID 1
             cd /