diff --git a/arch/avr/src/atmega/atmega_lowinit.c b/arch/avr/src/atmega/atmega_lowinit.c
index 4720161bf47..417f4e2eb12 100644
--- a/arch/avr/src/atmega/atmega_lowinit.c
+++ b/arch/avr/src/atmega/atmega_lowinit.c
@@ -38,6 +38,7 @@
  **************************************************************************/
 
 #include <nuttx/config.h>
+#include <avr/wdt.h>
 
 #include "atmega_config.h"
 #include "up_internal.h"