diff --git a/lib.nix b/lib.nix
index e1b3c1f..cb5b055 100644
--- a/lib.nix
+++ b/lib.nix
@@ -124,7 +124,7 @@ in
             echo "PostgreSQL initdb process completed"
             echo
           fi
-          cp {configFile} "$PGDATA"/postgresql.conf
+          cp ${configFile} "$PGDATA"/postgresql.conf
           # sed "s|@PGHOST@|''${PGHOST}|g" ${configFile} > "$PGDATA"/postgresql.conf
           if [[ "$POSTGRES_RUN_INITIAL_SCRIPT" == "true" ]]; then
             echo