diff --git a/demos/ARM7-AT91SAM7X-GCC/halconf.h b/demos/ARM7-AT91SAM7X-GCC/halconf.h
index 648a113e7..2faba92d8 100644
--- a/demos/ARM7-AT91SAM7X-GCC/halconf.h
+++ b/demos/ARM7-AT91SAM7X-GCC/halconf.h
@@ -55,13 +55,6 @@
 #define CH_HAL_USE_MAC                  FALSE
 #endif
 
-/**
- * @brief Enables the MII subsystem.
- */
-#if !defined(CH_HAL_USE_MII) || defined(__DOXYGEN__)
-#define CH_HAL_USE_MII                  FALSE
-#endif
-
 /**
  * @brief Enables the SERIAL subsystem.
  */
diff --git a/demos/ARM7-AT91SAM7X-LWIP-GCC/halconf.h b/demos/ARM7-AT91SAM7X-LWIP-GCC/halconf.h
index 29fa51738..9f7060cf3 100644
--- a/demos/ARM7-AT91SAM7X-LWIP-GCC/halconf.h
+++ b/demos/ARM7-AT91SAM7X-LWIP-GCC/halconf.h
@@ -55,13 +55,6 @@
 #define CH_HAL_USE_MAC                  TRUE
 #endif
 
-/**
- * @brief Enables the MII subsystem.
- */
-#if !defined(CH_HAL_USE_MII) || defined(__DOXYGEN__)
-#define CH_HAL_USE_MII                  TRUE
-#endif
-
 /**
  * @brief Enables the SERIAL subsystem.
  */
diff --git a/demos/ARM7-AT91SAM7X-UIP-GCC/halconf.h b/demos/ARM7-AT91SAM7X-UIP-GCC/halconf.h
index 29fa51738..9f7060cf3 100644
--- a/demos/ARM7-AT91SAM7X-UIP-GCC/halconf.h
+++ b/demos/ARM7-AT91SAM7X-UIP-GCC/halconf.h
@@ -55,13 +55,6 @@
 #define CH_HAL_USE_MAC                  TRUE
 #endif
 
-/**
- * @brief Enables the MII subsystem.
- */
-#if !defined(CH_HAL_USE_MII) || defined(__DOXYGEN__)
-#define CH_HAL_USE_MII                  TRUE
-#endif
-
 /**
  * @brief Enables the SERIAL subsystem.
  */
diff --git a/demos/ARMCM3-STM32F103-FATFS-GCC/halconf.h b/demos/ARMCM3-STM32F103-FATFS-GCC/halconf.h
index ffcfd2a0b..94136ff29 100644
--- a/demos/ARMCM3-STM32F103-FATFS-GCC/halconf.h
+++ b/demos/ARMCM3-STM32F103-FATFS-GCC/halconf.h
@@ -55,13 +55,6 @@
 #define CH_HAL_USE_MAC                  FALSE
 #endif
 
-/**
- * @brief Enables the MII subsystem.
- */
-#if !defined(CH_HAL_USE_MII) || defined(__DOXYGEN__)
-#define CH_HAL_USE_MII                  FALSE
-#endif
-
 /**
  * @brief Enables the SERIAL subsystem.
  */
diff --git a/demos/ARMCM3-STM32F103-GCC/halconf.h b/demos/ARMCM3-STM32F103-GCC/halconf.h
index 648a113e7..2faba92d8 100644
--- a/demos/ARMCM3-STM32F103-GCC/halconf.h
+++ b/demos/ARMCM3-STM32F103-GCC/halconf.h
@@ -55,13 +55,6 @@
 #define CH_HAL_USE_MAC                  FALSE
 #endif
 
-/**
- * @brief Enables the MII subsystem.
- */
-#if !defined(CH_HAL_USE_MII) || defined(__DOXYGEN__)
-#define CH_HAL_USE_MII                  FALSE
-#endif
-
 /**
  * @brief Enables the SERIAL subsystem.
  */
diff --git a/os/hal/platforms/AT91SAM7/at91sam7_mii.c b/os/hal/platforms/AT91SAM7/at91sam7_mii.c
index 2b7491e38..d48d81c10 100644
--- a/os/hal/platforms/AT91SAM7/at91sam7_mii.c
+++ b/os/hal/platforms/AT91SAM7/at91sam7_mii.c
@@ -26,9 +26,10 @@
 
 #include "ch.h"
 #include "hal.h"
-
 #include "at91sam7_mii.h"
 
+#if CH_HAL_USE_MAC || defined(__DOXYGEN__)
+
 /**
  * @brief Low level MII driver initialization.
  */
@@ -112,4 +113,6 @@ void miiPut(MACDriver *macp, phyaddr_t addr, phyreg_t value) {
     ;
 }
 
+#endif /* CH_HAL_USE_MAC */
+
 /** @} */
diff --git a/os/hal/platforms/AT91SAM7/at91sam7_mii.h b/os/hal/platforms/AT91SAM7/at91sam7_mii.h
index 6db87e31c..7bf472a61 100644
--- a/os/hal/platforms/AT91SAM7/at91sam7_mii.h
+++ b/os/hal/platforms/AT91SAM7/at91sam7_mii.h
@@ -27,6 +27,8 @@
 #ifndef _AT91SAM7_MII_H_
 #define _AT91SAM7_MII_H_
 
+#if CH_HAL_USE_MAC || defined(__DOXYGEN__)
+
 /*===========================================================================*/
 /* Driver pre-compile time settings.                                         */
 /*===========================================================================*/
@@ -96,6 +98,8 @@ extern "C" {
 }
 #endif
 
+#endif /* CH_HAL_USE_MAC */
+
 #endif /* _AT91SAM7_MII_H_ */
 
 /** @} */
diff --git a/os/hal/platforms/AT91SAM7/mac_lld.c b/os/hal/platforms/AT91SAM7/mac_lld.c
index 6112a13ad..11c3413f8 100644
--- a/os/hal/platforms/AT91SAM7/mac_lld.c
+++ b/os/hal/platforms/AT91SAM7/mac_lld.c
@@ -29,7 +29,6 @@
 #include "ch.h"
 #include "hal.h"
 #include "mii.h"
-
 #include "at91sam7_mii.h"
 
 #if CH_HAL_USE_MAC || defined(__DOXYGEN__)
diff --git a/os/hal/templates/halconf.h b/os/hal/templates/halconf.h
index f08ffcda5..35948950b 100644
--- a/os/hal/templates/halconf.h
+++ b/os/hal/templates/halconf.h
@@ -55,13 +55,6 @@
 #define CH_HAL_USE_MAC                  TRUE
 #endif
 
-/**
- * @brief Enables the MII subsystem.
- */
-#if !defined(CH_HAL_USE_MII) || defined(__DOXYGEN__)
-#define CH_HAL_USE_MII                  TRUE
-#endif
-
 /**
  * @brief Enables the SERIAL subsystem.
  */