diff --git a/modules/Datenschreiber.py b/modules/Datenschreiber.py
index 71e988b..aa91308 100644
--- a/modules/Datenschreiber.py
+++ b/modules/Datenschreiber.py
@@ -209,7 +209,7 @@ class Datenschreiber:
                     continue
 
             layer_name_raw = thema or str(ident)
-            layer_name = re.sub(r"[^A-Za-z0-9_]+", "_", layer_name_raw).strip("_")
+            layer_name = re.sub(r"[^A-Za-z0-9_ÄäÖöÜüß]+", "_", layer_name_raw).strip("_")
             if not layer_name:
                 layer_name = f"layer_{ident}"