diff --git a/hal/stm32h5.c b/hal/stm32h5.c
index 9345895c..3f0d1651 100644
--- a/hal/stm32h5.c
+++ b/hal/stm32h5.c
@@ -323,7 +323,7 @@ void RAMFUNCTION hal_flash_opt_unlock(void)
         DMB();
         FLASH_OPTKEYR = FLASH_OPTKEY2;
         DMB();
-        while ((FLASH_CR & FLASH_CR_LOCK) != 0)
+        while ((FLASH_OPTCR & FLASH_OPTCR_OPTLOCK) != 0)
             ;
     }
 
diff --git a/hal/stm32l5.c b/hal/stm32l5.c
index ef01d34e..6bfb02a1 100644
--- a/hal/stm32l5.c
+++ b/hal/stm32l5.c
@@ -228,7 +228,7 @@ void RAMFUNCTION hal_flash_opt_unlock(void)
         DMB();
         FLASH_OPTKEYR = FLASH_OPTKEY2;
         DMB();
-        while ((FLASH_CR & FLASH_CR_LOCK) != 0)
+        while ((FLASH_CR & FLASH_CR_OPTLOCK) != 0)
             ;
     }
 
diff --git a/hal/stm32u5.c b/hal/stm32u5.c
index fbcb9904..62940bbd 100644
--- a/hal/stm32u5.c
+++ b/hal/stm32u5.c
@@ -158,7 +158,7 @@ void RAMFUNCTION hal_flash_opt_unlock(void)
         DMB();
         FLASH_NS_OPTKEYR = FLASH_OPTKEY2;
         DMB();
-        while ((FLASH_NS_CR & FLASH_CR_LOCK) != 0)
+        while ((FLASH_NS_CR & FLASH_CR_OPTLOCK) != 0)
             ;
     }
 }