diff --git a/hydromt/data_adapter/dataframe.py b/hydromt/data_adapter/dataframe.py
index 747ded2ce..368e96380 100644
--- a/hydromt/data_adapter/dataframe.py
+++ b/hydromt/data_adapter/dataframe.py
@@ -178,7 +178,7 @@ def to_file(
         elif driver == "excel":
             fn_out = join(data_root, f"{data_name}.xlsx")
             obj.to_excel(fn_out, **kwargs)
-        else:
+        return fn_out, driver, read_kwargs
             raise ValueError(f"DataFrame: Driver {driver} is unknown.")
 
         return fn_out, driver, kwargs