diff --git a/applications/apertif/designs/apertif_unb1_fn_bf_emu/src/vhdl/apertif_unb1_fn_bf_emu.vhd b/applications/apertif/designs/apertif_unb1_fn_bf_emu/src/vhdl/apertif_unb1_fn_bf_emu.vhd
index 4d14c8d3409d6180eb983ed219f8853addd8cb46..6b58009ef865be86313ea9865f3f7977d1267b36 100644
--- a/applications/apertif/designs/apertif_unb1_fn_bf_emu/src/vhdl/apertif_unb1_fn_bf_emu.vhd
+++ b/applications/apertif/designs/apertif_unb1_fn_bf_emu/src/vhdl/apertif_unb1_fn_bf_emu.vhd
@@ -136,7 +136,7 @@ ARCHITECTURE str OF apertif_unb1_fn_bf_emu IS
                                                           TO_UVEC(c_bg_blocks_per_sync, c_diag_bg_blocks_per_sync_w),
                                                           TO_UVEC(        c_bg_gapsize, c_diag_bg_gapsize_w),
                                                           TO_UVEC(                   0, c_diag_bg_mem_low_adrs_w),
-                                                          TO_UVEC(c_bg_mem_high_addr-1, c_diag_bg_mem_high_adrs_w),
+                                                          TO_UVEC(  c_bg_mem_high_addr, c_diag_bg_mem_high_adrs_w),
                                                           TO_UVEC(                   0, c_diag_bg_bsn_init_w));
   -- Interface: 10GbE
   CONSTANT c_nof_10GbE_offload_streams : NATURAL := 1;