diff --git a/km3buu/output.py b/km3buu/output.py
index f413b3f0b9865924b265119f69cf42c4c244a8ab..7c98a07e15d731b31c1f04e7f14c0b7b59bcddec 100644
--- a/km3buu/output.py
+++ b/km3buu/output.py
@@ -92,7 +92,7 @@ ROOTTUPLE_KEY = "RootTuple"
 EMPTY_KM3NET_HEADER_DICT = {
     "start_run": "0",
     "XSecFile": "",
-    "drawing": "",
+    "drawing": "volume",
     "detector": "",
     "depth": "2475.0",
     "muon_desc_file": "",