diff --git a/os/hal/ports/STM32/STM32F1xx/hal_efl_lld.c b/os/hal/ports/STM32/STM32F1xx/hal_efl_lld.c
index d25238639..eab83cf89 100644
--- a/os/hal/ports/STM32/STM32F1xx/hal_efl_lld.c
+++ b/os/hal/ports/STM32/STM32F1xx/hal_efl_lld.c
@@ -32,7 +32,6 @@
 /* Driver local definitions.                                                 */
 /*===========================================================================*/
 
-#define STM32_FLASH_SECTOR_SIZE             1024U
 #define STM32_FLASH_LINE_SIZE               2U
 #define STM32_FLASH_LINE_MASK               (STM32_FLASH_LINE_SIZE - 1U)
 
@@ -321,8 +320,8 @@ flash_error_t efl_lld_program(void *instance, flash_offset_t offset,
 
 /**
  * @brief   Starts a whole-device erase operation.
- * @note    This function does nothing, as STM32F1 has only one bank
- *          and it is where the program is running on.
+ * @note    This function does nothing, the flash memory is where the program
+ *          is running on.
  *
  * @param[in] ip                    pointer to a @p EFlashDriver instance
  * @return                          An error code.
diff --git a/os/hal/ports/STM32/STM32F1xx/hal_efl_lld.h b/os/hal/ports/STM32/STM32F1xx/hal_efl_lld.h
index c2dfb1bac..33708d24a 100644
--- a/os/hal/ports/STM32/STM32F1xx/hal_efl_lld.h
+++ b/os/hal/ports/STM32/STM32F1xx/hal_efl_lld.h
@@ -51,6 +51,10 @@
 /* Derived constants and error checks.                                       */
 /*===========================================================================*/
 
+#if !defined(STM32_FLASH_SECTOR_SIZE)
+#error "STM32_FLASH_SECTOR_SIZE not defined in registry"
+#endif
+
 #if !defined(STM32_FLASH_NUMBER_OF_BANKS)
 #error "STM32_FLASH_NUMBER_OF_BANKS not defined in registry"
 #endif
diff --git a/os/hal/ports/STM32/STM32F1xx/stm32_registry.h b/os/hal/ports/STM32/STM32F1xx/stm32_registry.h
index f643b9bad..f00249a35 100644
--- a/os/hal/ports/STM32/STM32F1xx/stm32_registry.h
+++ b/os/hal/ports/STM32/STM32F1xx/stm32_registry.h
@@ -117,6 +117,7 @@
 
 /* Flash attributes.*/
 #define STM32_FLASH_NUMBER_OF_BANKS         1
+#define STM32_FLASH_SECTOR_SIZE             1024U
 #if !defined(STM32_FLASH_SECTORS_PER_BANK) || defined(__DOXYGEN__)
 #define STM32_FLASH_SECTORS_PER_BANK        32 /* Maximum, can be redefined.*/
 #endif
@@ -329,6 +330,7 @@
 
 /* Flash attributes.*/
 #define STM32_FLASH_NUMBER_OF_BANKS         1
+#define STM32_FLASH_SECTOR_SIZE             1024U
 #if !defined(STM32_FLASH_SECTORS_PER_BANK) || defined(__DOXYGEN__)
 #define STM32_FLASH_SECTORS_PER_BANK        32 /* Maximum, can be redefined.*/
 #endif
@@ -513,6 +515,7 @@
 
 /* Flash attributes.*/
 #define STM32_FLASH_NUMBER_OF_BANKS         1
+#define STM32_FLASH_SECTOR_SIZE             1024U
 #if !defined(STM32_FLASH_SECTORS_PER_BANK) || defined(__DOXYGEN__)
 #define STM32_FLASH_SECTORS_PER_BANK        128 /* Maximum, can be redefined.*/
 #endif
@@ -730,6 +733,7 @@
 
 /* Flash attributes.*/
 #define STM32_FLASH_NUMBER_OF_BANKS         1
+#define STM32_FLASH_SECTOR_SIZE             2048U
 #if !defined(STM32_FLASH_SECTORS_PER_BANK) || defined(__DOXYGEN__)
 #define STM32_FLASH_SECTORS_PER_BANK        256 /* Maximum, can be redefined.*/
 #endif
@@ -969,6 +973,7 @@
 
 /* Flash attributes.*/
 #define STM32_FLASH_NUMBER_OF_BANKS         2
+#define STM32_FLASH_SECTOR_SIZE             2048U
 #if !defined(STM32_FLASH_SECTORS_PER_BANK) || defined(__DOXYGEN__)
 #define STM32_FLASH_SECTORS_PER_BANK        256 /* Maximum, can be redefined.*/
 #endif
@@ -1228,6 +1233,7 @@
 
 /* Flash attributes.*/
 #define STM32_FLASH_NUMBER_OF_BANKS         1
+#define STM32_FLASH_SECTOR_SIZE             2048U
 #if !defined(STM32_FLASH_SECTORS_PER_BANK) || defined(__DOXYGEN__)
 #define STM32_FLASH_SECTORS_PER_BANK        128 /* Maximum, can be redefined.*/
 #endif