diff --git a/fpga/hls/hls_jfjoch.h b/fpga/hls/hls_jfjoch.h
index cbcc47a6..c16ac8d1 100644
--- a/fpga/hls/hls_jfjoch.h
+++ b/fpga/hls/hls_jfjoch.h
@@ -82,6 +82,7 @@ struct axis_completion {
     ap_uint<16> packet_count;
     ap_uint<5> module;
     ap_uint<1> flushing;
+    ap_uint<1> last;
 };
 
 void setup_datamover (hls::stream<axis_datamover_ctrl> &datamover_cmd_stream, uint64_t address, size_t bytes_to_write);
diff --git a/fpga/hls/save_to_hbm.cpp b/fpga/hls/save_to_hbm.cpp
index 31a9902a..c44e4dce 100644
--- a/fpga/hls/save_to_hbm.cpp
+++ b/fpga/hls/save_to_hbm.cpp
@@ -34,6 +34,7 @@ inline void write_completion(hls::stream<axis_completion> &m_axis_completion,
     cmpl.exptime = exptime;
     cmpl.data_collection_id = data_collection_id;
     cmpl.flushing = flushing;
+    cmpl.last = 0;
 }
 
 void save_to_hbm(STREAM_512 &data_in,
@@ -198,6 +199,12 @@ void save_to_hbm(STREAM_512 &data_in,
                              debug[m], timestamp[m], jf_bunchid[m],
                              exptime[m], data_collection_id, 1);
     }
+
     data_in >> packet_in;
+
+    axis_completion cmpl;
+    cmpl.last = 1;
+    completion_out << cmpl;
+
     idle = 1;
 }