diff --git a/src/stm32/flash.c b/src/stm32/flash.c
index ee0a711..50332ee 100644
--- a/src/stm32/flash.c
+++ b/src/stm32/flash.c
@@ -218,9 +218,15 @@ flash_write_block(uint32_t block_address, uint32_t *data)
     unlock_flash();
 
     // Erase page
-    if (need_erase)
+    if (need_erase) {
         erase_page(page_address);
 
+        // avoid triggering STM32H72xx write security
+        if (CONFIG_MACH_STM32H7) {
+            lock_flash();
+            unlock_flash();
+        }
+    }
     // Write block
     write_block(block_address, data);