diff --git a/cpu/atmega2560/include/periph_cpu.h b/cpu/atmega2560/include/periph_cpu.h
index 92fd809686..10cd8acc1e 100644
--- a/cpu/atmega2560/include/periph_cpu.h
+++ b/cpu/atmega2560/include/periph_cpu.h
@@ -44,6 +44,20 @@ enum {
     PORT_L = 10       /**< port L */
 };
 
+/**
+ * @brief   Available external interrupt pins on the ATmega2560 family
+ *
+ * In order of their interrupt number.
+ */
+#define CPU_ATMEGA_EXT_INTS    { GPIO_PIN(PORT_D, 0), \
+                                 GPIO_PIN(PORT_D, 1), \
+                                 GPIO_PIN(PORT_D, 2), \
+                                 GPIO_PIN(PORT_D, 3), \
+                                 GPIO_PIN(PORT_E, 4), \
+                                 GPIO_PIN(PORT_E, 5), \
+                                 GPIO_PIN(PORT_E, 6), \
+                                 GPIO_PIN(PORT_E, 7) }
+
 /**
  * @name   Defines for the I2C interface
  * @{