diff --git a/arch/arm/src/kinetis/kinetis_uid.c b/arch/arm/src/kinetis/kinetis_uid.c
index 3693b3507b..54a98d08ce 100644
--- a/arch/arm/src/kinetis/kinetis_uid.c
+++ b/arch/arm/src/kinetis/kinetis_uid.c
@@ -36,7 +36,7 @@
  * Included Files
  ************************************************************************************/
 
-//#include <nuttx/config.h>
+#include <nuttx/config.h>
 
 #include <chip/kinetis_k64memorymap.h>
 #include <chip/kinetis_sim.h>