diff --git a/arch/arm/src/am335x/am335x_gpio.h b/arch/arm/src/am335x/am335x_gpio.h
index 3c54d55c7d0..e510aff20aa 100644
--- a/arch/arm/src/am335x/am335x_gpio.h
+++ b/arch/arm/src/am335x/am335x_gpio.h
@@ -165,13 +165,6 @@ typedef uint32_t gpio_pinset_t;
  * Public Data
  ****************************************************************************/
 
-/****************************************************************************
- * Inline Functions
- ****************************************************************************/
-
-extern const uintptr_t g_gpiobase[AM335X_GPIO_NPORTS];
-#define am335x_gpion_vbase(n) (g_gpiobase[(n)])
-
 #undef EXTERN
 #if defined(__cplusplus)
 #define EXTERN extern "C"
@@ -181,6 +174,13 @@ extern "C"
 #define EXTERN extern
 #endif
 
+/****************************************************************************
+ * Inline Functions
+ ****************************************************************************/
+
+EXTERN const uintptr_t g_gpiobase[AM335X_GPIO_NPORTS];
+#define am335x_gpion_vbase(n) (g_gpiobase[(n)])
+
 /****************************************************************************
  * Public Function Prototypes
  ****************************************************************************/
diff --git a/arch/arm/src/common/arm_internal.h b/arch/arm/src/common/arm_internal.h
index 773650d5f22..7c625d847b2 100644
--- a/arch/arm/src/common/arm_internal.h
+++ b/arch/arm/src/common/arm_internal.h
@@ -358,9 +358,9 @@ uintptr_t arm_intstack_top(void);
 #if defined(__ICCARM__)
 /* _vectors replaced on __vector_table for IAR C-SPY Simulator */
 
-extern const void *__vector_table[];
+EXTERN const void *__vector_table[];
 #else
-extern const void * const _vectors[];
+EXTERN const void * const _vectors[];
 #endif
 
 /* Interrupt acknowledge and dispatch */
diff --git a/arch/arm/src/kinetis/kinetis_usbhshost.h b/arch/arm/src/kinetis/kinetis_usbhshost.h
index 7640e88b6a0..1cc48c882e5 100644
--- a/arch/arm/src/kinetis/kinetis_usbhshost.h
+++ b/arch/arm/src/kinetis/kinetis_usbhshost.h
@@ -74,7 +74,7 @@ extern "C"
  *
  ****************************************************************************/
 
-extern void kinetis_usbhost_vbusdrive(int rhport, bool enable);
+void kinetis_usbhost_vbusdrive(int rhport, bool enable);
 
 /****************************************************************************
  * Name: kinetis_setup_overcurrent
@@ -93,7 +93,7 @@ extern void kinetis_usbhost_vbusdrive(int rhport, bool enable);
  *
  ****************************************************************************/
 
-extern int kinetis_setup_overcurrent(xcpt_t handler, void *arg);
+int kinetis_setup_overcurrent(xcpt_t handler, void *arg);
 
 /****************************************************************************
  * Name: kinetis_ehci_initialize
diff --git a/arch/arm/src/s32k1xx/s32k1xx_clockconfig.h b/arch/arm/src/s32k1xx/s32k1xx_clockconfig.h
index 01cd3fd4702..2719896affd 100644
--- a/arch/arm/src/s32k1xx/s32k1xx_clockconfig.h
+++ b/arch/arm/src/s32k1xx/s32k1xx_clockconfig.h
@@ -86,8 +86,6 @@
  * Public Types
  ****************************************************************************/
 
-extern const unsigned int num_of_peripheral_clocks_0;
-
 /* Clock Configuration ******************************************************/
 
 enum scg_system_clock_type_e
@@ -456,10 +454,6 @@ enum scg_system_clock_mode_e
 
 #ifndef __ASSEMBLY__
 
-/****************************************************************************
- * Public Data
- ****************************************************************************/
-
 #undef EXTERN
 #if defined(__cplusplus)
 #define EXTERN extern "C"
@@ -469,6 +463,12 @@ extern "C"
 #define EXTERN extern
 #endif
 
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+EXTERN const unsigned int num_of_peripheral_clocks_0;
+
 /****************************************************************************
  * Public Function Prototypes
  ****************************************************************************/