diff --git a/libraries/AP_Logger/LoggerMessageWriter.cpp b/libraries/AP_Logger/LoggerMessageWriter.cpp
index 4b02225efc..0c15f73b8a 100644
--- a/libraries/AP_Logger/LoggerMessageWriter.cpp
+++ b/libraries/AP_Logger/LoggerMessageWriter.cpp
@@ -279,7 +279,7 @@ void LoggerMessageWriter_WriteSysInfo::process() {
         FALLTHROUGH;
     }
     case Stage::SYSTEM_ID:
-        char sysid[40];
+        char sysid[50];
         if (hal.util->get_system_id(sysid)) {
             if (! _logger_backend->Write_Message(sysid)) {
                 return; // call me again