diff --git a/libraries/AP_Common/AP_CarbonixCustom.h b/libraries/AP_Common/AP_CarbonixCustom.h
new file mode 100644
index 0000000000..c771377664
--- /dev/null
+++ b/libraries/AP_Common/AP_CarbonixCustom.h
@@ -0,0 +1,5 @@
+#ifdef AP_CUSTOM_FIRMWARE_STRING
+#undef AP_CUSTOM_FIRMWARE_STRING
+#endif
+
+#define AP_CUSTOM_FIRMWARE_STRING "CarboPilot V5.0.0-beta3"
diff --git a/libraries/AP_Common/AP_FWVersionDefine.h b/libraries/AP_Common/AP_FWVersionDefine.h
index 481f1cbdcd..fa6a4a4ac8 100644
--- a/libraries/AP_Common/AP_FWVersionDefine.h
+++ b/libraries/AP_Common/AP_FWVersionDefine.h
@@ -22,6 +22,7 @@
 
 #include <AP_Common/AP_FWVersion.h>
 #include <AP_Vehicle/AP_Vehicle_Type.h>
+#include <AP_Common/AP_CarbonixCustom.h>
 
 /*
   allow vendors to set AP_CUSTOM_FIRMWARE_STRING in hwdef.dat