diff --git a/rerun_py/rerun_sdk/rerun/blueprint/datatypes/utf8list_ext.py b/rerun_py/rerun_sdk/rerun/blueprint/datatypes/utf8list_ext.py
index 785e00acd7fd..6c5248b34f6a 100644
--- a/rerun_py/rerun_sdk/rerun/blueprint/datatypes/utf8list_ext.py
+++ b/rerun_py/rerun_sdk/rerun/blueprint/datatypes/utf8list_ext.py
@@ -31,7 +31,7 @@ def native_to_pa_array_override(data: Utf8ListArrayLike, data_type: pa.DataType)
             if len(data) == 0:
                 array = []
             elif isinstance(data[0], Utf8List):
-                array = [datum.value for datum in data]  # type: ignore[union-attr]
+                array = [[datum.value for datum in data]]  # type: ignore[union-attr]
             else:
                 array = [[str(datum) for datum in data]]
         else: