diff --git a/frappy_psi/sea.py b/frappy_psi/sea.py
index 0fc78e0..5bc6276 100644
--- a/frappy_psi/sea.py
+++ b/frappy_psi/sea.py
@@ -505,9 +505,7 @@ class SeaModule(Module):
                     raise ConfigError(f"{sea_object}/{paramdesc['path']} is not writable")
                 paramdesc['key'] = 'target'
                 paramdesc['readonly'] = False
-            extra_module_set = cfgdict.pop('extra_modules', ())
-            if extra_module_set:
-                extra_module_set = set(extra_module_set.replace(',', ' ').split())
+            extra_module_set = set(cfgdict.pop('extra_modules', ()))
         path2param = {}
         attributes = {'sea_object': sea_object, 'path2param': path2param}