diff --git a/portable/GCC/ATmegaxxxx/portmacro.h b/portable/GCC/ATmegaxxxx/portmacro.h
index ad92b0858..9a520d509 100644
--- a/portable/GCC/ATmegaxxxx/portmacro.h
+++ b/portable/GCC/ATmegaxxxx/portmacro.h
@@ -42,6 +42,8 @@ extern "C" {
  *-----------------------------------------------------------
  */
 
+#include <avr/wdt.h>
+
 /* Type definitions. */
 
 #define portCHAR                    char