diff --git a/radio/src/targets/taranis/flash_driver.cpp b/radio/src/targets/taranis/flash_driver.cpp
index 85a51e42f..4a2bae743 100644
--- a/radio/src/targets/taranis/flash_driver.cpp
+++ b/radio/src/targets/taranis/flash_driver.cpp
@@ -37,7 +37,7 @@ void unlockFlash()
 
 void lockFlash()
 {
-  while (!FLASH->SR & FLASH_SR_BSY);
+  while (!(FLASH->SR & FLASH_SR_BSY));
   FLASH->CR |= FLASH_CR_LOCK;
 }