diff --git a/fpga/hls/hls_jfjoch.h b/fpga/hls/hls_jfjoch.h
index b79b4600..a59ff03f 100644
--- a/fpga/hls/hls_jfjoch.h
+++ b/fpga/hls/hls_jfjoch.h
@@ -53,6 +53,7 @@ typedef hls::stream<packet_512_t> STREAM_512;
 #define ACT_REG_NFRAMES(x)                ((x)(95 ,  64)) // 32 bit
 #define ACT_REG_NMODULES(x)               ((x)(132, 128)) // 5 bit (0..31)
 #define ACT_REG_NSTORAGE_CELLS(x)         ((x)(148, 144)) // 5 bit
+#define ACT_REG_SPOT_FINDER_THRESHOLD(x)  ((x)(175, 160)) // 16 bit
 
 struct axis_datamover_ctrl {
     ap_uint<40+64> data;
diff --git a/fpga/hls/spot_finder.cpp b/fpga/hls/spot_finder.cpp
index f5d13af7..fd999d09 100644
--- a/fpga/hls/spot_finder.cpp
+++ b/fpga/hls/spot_finder.cpp
@@ -1,7 +1,5 @@
 // Copyright (2019-2023) Paul Scherrer Institute
 
-// Copyright (2019-2023) Paul Scherrer Institute
-
 #include "hls_jfjoch.h"
 
 void spot_finder(STREAM_512 &data_in,
@@ -15,6 +13,7 @@ void spot_finder(STREAM_512 &data_in,
     packet_512_t packet;
     data_in >> packet;
     data_out << packet;
+    ap_int<16> threshold = ACT_REG_SPOT_FINDER_THRESHOLD(packet.data);
 
     ap_uint<32> result[RAW_MODULE_SIZE * sizeof(uint16_t) / 64];
 #pragma HLS ARRAY_PARTITION variable=result type=cyclic factor=16
@@ -24,13 +23,13 @@ void spot_finder(STREAM_512 &data_in,
     while (!packet.user) {
         for (int i = 0; i < RAW_MODULE_SIZE * sizeof(uint16_t) / 64; i++) {
 #pragma HLS PIPELINE II=1
-            ap_uint<32> output = 0;
             data_out << packet;
             unpack32(packet.data, val);
-            for (int j = 0; j < 32; j++) {
-                if (val[j] > 5)
-                    output[j] = 1;
-            }
+
+            ap_uint<32> output;
+            for (int j = 0; j < 32; j++)
+                output[j] = ((val[j] > threshold) ? 1 : 0);
+
             data_in >> packet;
             result[i] = output;
         }