diff --git a/cfg/main/haake_cfg.py b/cfg/main/haake_cfg.py
index e9d8191..6c3b49d 100644
--- a/cfg/main/haake_cfg.py
+++ b/cfg/main/haake_cfg.py
@@ -12,7 +12,7 @@ Mod('th',
     meaning = ('temperature', 10),
     io = 'sea_main',
     sea_object = 'th',
-    extra_modules='t2',
+    extra_modules=['t2'],
 )
 Mod('ts',
     'frappy_psi.sea.SeaReadable', '',