diff --git a/targets/TARGET_STM/TARGET_STM32WB/TARGET_STM32WB55xG/device/TOOLCHAIN_ARM_MICRO/stm32wb55xx.sct b/targets/TARGET_STM/TARGET_STM32WB/TARGET_STM32WB55xG/device/TOOLCHAIN_ARM_MICRO/stm32wb55xx.sct
index 8d688e805f..7f35e4be6d 100644
--- a/targets/TARGET_STM/TARGET_STM32WB/TARGET_STM32WB55xG/device/TOOLCHAIN_ARM_MICRO/stm32wb55xx.sct
+++ b/targets/TARGET_STM/TARGET_STM32WB/TARGET_STM32WB55xG/device/TOOLCHAIN_ARM_MICRO/stm32wb55xx.sct
@@ -34,7 +34,7 @@
 #endif
 
 #if !defined(MBED_APP_SIZE)
-; 812KB FLASH
+; 768KB FLASH
 #define MBED_APP_SIZE 0xC0000
 #endif