diff --git a/libraries/base/reorder/src/vhdl/reorder_transpose.vhd b/libraries/base/reorder/src/vhdl/reorder_transpose.vhd
index 75c920c0b798a0a3ca4b33fb17d05fb05f08b507..2a660a9f22b8f21c71614e9a60d81a426b9eb57f 100644
--- a/libraries/base/reorder/src/vhdl/reorder_transpose.vhd
+++ b/libraries/base/reorder/src/vhdl/reorder_transpose.vhd
@@ -125,6 +125,7 @@ ARCHITECTURE str OF reorder_transpose IS
   CONSTANT c_total_data_w     : NATURAL  := g_nof_streams*g_in_dat_w;
   CONSTANT c_complex_data_w   : NATURAL  := c_total_data_w*c_nof_complex;
   CONSTANT c_data_w           : NATURAL  := sel_a_b(g_use_complex, c_complex_data_w, c_total_data_w);
+  CONSTANT c_data_w_pre       : NATURAL  := sel_a_b(g_use_complex, c_total_data_w, c_total_data_w/2);  -- Datawidth for pre-transpose defines Re or Im part.
                                          
   CONSTANT c_nof_ch_in        : NATURAL  := g_frame_size_in*g_reorder_seq.rd_chunksize;
   CONSTANT c_nof_ch_sel       : NATURAL  := g_reorder_seq.wr_chunksize*g_reorder_seq.rd_chunksize;
@@ -219,7 +220,7 @@ BEGIN
   gen_pre_transpose : IF g_ena_pre_transp = TRUE GENERATE 
     u_single_ss : ENTITY work.reorder_col
     GENERIC MAP (
-      g_dsp_data_w         => c_total_data_w,
+      g_dsp_data_w         => c_data_w_pre,
       g_nof_ch_in          => c_nof_ch_in,
       g_nof_ch_sel         => c_nof_ch_sel,
       g_select_file_name   => g_select_file,