diff --git a/hw/application_fpga/application_fpga.bin.sha256 b/hw/application_fpga/application_fpga.bin.sha256
index 6b3aa34..08caf50 100644
--- a/hw/application_fpga/application_fpga.bin.sha256
+++ b/hw/application_fpga/application_fpga.bin.sha256
@@ -1 +1 @@
-2a3928e8587c8d5d7eca6048c6448dc1d16d52a9a25d3ca5026bec3e7fb14ef3  application_fpga.bin
+44086edb70377991b57d3f1c231f743fcf0c2c9d2303843ec133f76cc42449a8  application_fpga.bin
diff --git a/hw/application_fpga/core/tk1/rtl/tk1.v b/hw/application_fpga/core/tk1/rtl/tk1.v
index 4f481b5..7e39ce0 100644
--- a/hw/application_fpga/core/tk1/rtl/tk1.v
+++ b/hw/application_fpga/core/tk1/rtl/tk1.v
@@ -13,7 +13,9 @@
 
 `default_nettype none
 
-module tk1 (
+module tk1 #(
+    parameter [31:0] APP_SIZE = 32'h0
+) (
     input wire clk,
     input wire reset_n,
 
@@ -255,7 +257,7 @@ module tk1 (
       gpio3_reg         <= 1'h0;
       gpio4_reg         <= 1'h0;
       app_start_reg     <= 32'h0;
-      app_size_reg      <= 32'h0;
+      app_size_reg      <= APP_SIZE;
       blake2s_addr_reg  <= 32'h0;
       cdi_mem[0]        <= 32'h0;
       cdi_mem[1]        <= 32'h0;