diff --git a/src/usb-dbg.cpp b/src/usb-dbg.cpp
index c9f464f..52dfa29 100644
--- a/src/usb-dbg.cpp
+++ b/src/usb-dbg.cpp
@@ -811,10 +811,13 @@
             reply.read(postcodes);
 
             // Insert retrieved postcodes into frame_postcode
-            std::string result;
             for (const auto& [code, extra] : postcodes)
             {
-                result = std::format("{:02x}", code);
+                std::string result = std::format("{:02x}", code);
+                for (const auto& byte : extra)
+                {
+                    result += std::format("{:02x}", byte);
+                }
                 frame_postcode.append(result);
             }
         }