diff --git a/radio/src/boards/jumper-h750/board.h b/radio/src/boards/jumper-h750/board.h
index dd02337f4..354d4bbd9 100644
--- a/radio/src/boards/jumper-h750/board.h
+++ b/radio/src/boards/jumper-h750/board.h
@@ -30,6 +30,7 @@
 #include "hal/serial_port.h"
 #include "hal/watchdog_driver.h"
 
+#define FLASHSIZE                       0x1000000
 #define BOOTLOADER_SIZE                 0x10000
 #define BOOTLOADER_ADDRESS              0x08000000
 #define FIRMWARE_ADDRESS                0x90000000
diff --git a/radio/src/boards/rm-h750/board.h b/radio/src/boards/rm-h750/board.h
index 3bae5a600..aed9be1aa 100644
--- a/radio/src/boards/rm-h750/board.h
+++ b/radio/src/boards/rm-h750/board.h
@@ -30,6 +30,7 @@
 #include "hal/serial_port.h"
 #include "hal/watchdog_driver.h"
 
+#define FLASHSIZE                       0x1000000
 #define BOOTLOADER_SIZE                 0x10000
 #define BOOTLOADER_ADDRESS              0x08000000
 #define FIRMWARE_ADDRESS                0x90000000