diff --git a/arch/arm/src/kinetis/kinetis_start.c b/arch/arm/src/kinetis/kinetis_start.c
index f70b9a7368..41df37aa4d 100644
--- a/arch/arm/src/kinetis/kinetis_start.c
+++ b/arch/arm/src/kinetis/kinetis_start.c
@@ -65,10 +65,13 @@
 #ifdef CONFIG_ARCH_FPU
 static inline void kinetis_fpuconfig(void);
 #endif
+
+#if 0 /* Not used */
 #ifdef CONFIG_STACK_COLORATION
 static void go_os_start(void *pv, unsigned int nbytes)
   __attribute__ ((naked, no_instrument_function, noreturn));
 #endif
+#endif
 
 /****************************************************************************
  * Pre-processor Definitions
@@ -225,6 +228,7 @@ static inline void kinetis_fpuconfig(void)
  *
  ****************************************************************************/
 
+#if 0 /* Not used */
 #ifdef CONFIG_STACK_COLORATION
 static void go_os_start(void *pv, unsigned int nbytes)
 {
@@ -256,6 +260,7 @@ static void go_os_start(void *pv, unsigned int nbytes)
   );
 }
 #endif
+#endif
 
 /****************************************************************************
  * Public Functions
diff --git a/libc/net/lib_inetntop.c b/libc/net/lib_inetntop.c
index f62ceb9889..7aba154108 100644
--- a/libc/net/lib_inetntop.c
+++ b/libc/net/lib_inetntop.c
@@ -107,7 +107,7 @@ static int inet_ipv4_ntop(FAR const void *src, FAR char *dest, socklen_t size)
       return -ENOSPC;
     }
 
-  ptr = (FAR char *)src;
+  ptr = (FAR uint8_t *)src;
   sprintf(dest, "%u.%u.%u.%u", ptr[0], ptr[1], ptr[2], ptr[3]);
   return OK;
 }