diff --git a/wgmaster/migrate.py b/wgmaster/migrate.py
index 2918970..08457cc 100755
--- a/wgmaster/migrate.py
+++ b/wgmaster/migrate.py
@@ -915,7 +915,7 @@ def migrate_parameters(in_dir: str, out_dir: str) -> None:
     shortened = name.replace(' für ', ' f. ').replace(' und ', ' u. ')
     suffix = params['MANDANTENNAME2'].lower().replace(' ', '').replace('.', '')
     suffixes = {
-        'reggenmbg': 'reg. Gen.m.b.H.'
+        'reggenmbh': 'reg. Gen.m.b.H.'
     }
 
     new_params: Dict[str, Optional[str]] = {
@@ -938,7 +938,7 @@ def migrate_parameters(in_dir: str, out_dir: str) -> None:
         'WEBSITE': params['MANDANTENHOMEPAGE'],
     }
 
-    with open(f'{out_dir}/client_parameter.csv') as f:
+    with open(f'{out_dir}/client_parameter.csv', 'w+', encoding='utf-8') as f:
         f.write('param;value\n')
         for param, value in new_params.items():
             f.write(csv.format_row(param, value))
@@ -982,7 +982,7 @@ def main() -> None:
     migrate_contracts(args.in_dir, args.out_dir)
     migrate_deliveries(args.in_dir, args.out_dir)
     migrate_payments(args.in_dir, args.out_dir)
-    migrate_parameters((args.in_dir, args.out_dir))
+    migrate_parameters(args.in_dir, args.out_dir)
 
     DB_CNX.close()