diff --git a/applications/apertif/designs/apertif_unb1_fn_beamformer/src/vhdl/apertif_unb1_fn_beamformer.vhd b/applications/apertif/designs/apertif_unb1_fn_beamformer/src/vhdl/apertif_unb1_fn_beamformer.vhd
index 135cfc3d36a62bde61d95d8820d3499f3f77e409..f3e2837fbf76eaf728cfe37284c31aa27a4e4c38 100644
--- a/applications/apertif/designs/apertif_unb1_fn_beamformer/src/vhdl/apertif_unb1_fn_beamformer.vhd
+++ b/applications/apertif/designs/apertif_unb1_fn_beamformer/src/vhdl/apertif_unb1_fn_beamformer.vhd
@@ -189,6 +189,7 @@ ARCHITECTURE str OF apertif_unb1_fn_beamformer IS
   CONSTANT c_rd_interval        : NATURAL := c_rd_chunksize;
   CONSTANT c_gapsize            : NATURAL := 0; 
   CONSTANT c_nof_blocks         : NATURAL := sel_a_b(g_sim, 16, 800000); --800000  781250);
+  CONSTANT c_bsn_sync_time_out  : NATURAL := c_nof_blocks * g_bf.nof_weights;
   
   CONSTANT c_reorder_seq_conf   : t_reorder_seq := (c_wr_chunksize, 
                                                     c_rd_chunksize, 
@@ -728,7 +729,8 @@ BEGIN
   u_bsn_monitor_align : ENTITY dp_lib.mms_dp_bsn_monitor
   GENERIC MAP (
     g_nof_streams        => 2, 
-    g_cross_clock_domain => TRUE,
+    g_cross_clock_domain => TRUE,    
+    g_sync_timeout       => c_bsn_sync_time_out,
     g_bsn_w              => c_dp_stream_bsn_w,
     g_cnt_sop_w          => c_word_w,
     g_cnt_valid_w        => c_word_w,