diff --git a/Firmware/RTK_mosaic-T_Firmware/RTK_mosaic-T_Firmware.ino b/Firmware/RTK_mosaic-T_Firmware/RTK_mosaic-T_Firmware.ino
index 1b6ea83..59f9ef4 100644
--- a/Firmware/RTK_mosaic-T_Firmware/RTK_mosaic-T_Firmware.ino
+++ b/Firmware/RTK_mosaic-T_Firmware/RTK_mosaic-T_Firmware.ino
@@ -14,8 +14,10 @@
 */
 
 // This is passed in from compiler extra flags
+#ifndef FIRMWARE_VERSION_MAJOR
 #define FIRMWARE_VERSION_MAJOR 9
 #define FIRMWARE_VERSION_MINOR 9
+#endif
 
 // Define the RTK board identifier:
 //  This is an int which is unique to this variant of the RTK Surveyor hardware which allows us