diff --git a/c_src/adbc_column.hpp b/c_src/adbc_column.hpp
index cc306f9..bd4a565 100644
--- a/c_src/adbc_column.hpp
+++ b/c_src/adbc_column.hpp
@@ -119,7 +119,8 @@ ERL_NIF_TERM make_adbc_column(ErlNifEnv *env, struct ArrowSchema * schema, ERL_N
 
     if (data_ref) {
         keys.emplace_back(kAtomDataKey);
-        values.emplace_back(data_ref.value());
+        ERL_NIF_TERM data_ref_list = enif_make_list1(env, data_ref.value());
+        values.emplace_back(data_ref_list);
     }
 
     ERL_NIF_TERM adbc_column;
diff --git a/lib/adbc_connection.ex b/lib/adbc_connection.ex
index 9e7032c..2cdf86c 100644
--- a/lib/adbc_connection.ex
+++ b/lib/adbc_connection.ex
@@ -410,10 +410,7 @@ defmodule Adbc.Connection do
   defp merge_columns(chucked_results) do
     Enum.zip_with(chucked_results, fn columns ->
       Enum.reduce(columns, fn column, merged_column ->
-        merged_data =
-          List.wrap(merged_column.data) ++ List.wrap(column.data)
-
-        %{merged_column | data: merged_data}
+        %{merged_column | data: merged_column.data ++ column.data}
       end)
     end)
   end