diff --git a/cpu/atmega_common/periph/gpio.c b/cpu/atmega_common/periph/gpio.c
index b629cac81d..65cbdc22f3 100644
--- a/cpu/atmega_common/periph/gpio.c
+++ b/cpu/atmega_common/periph/gpio.c
@@ -301,7 +301,7 @@ int gpio_init_int(gpio_t pin, gpio_mode_t mode, gpio_flank_t flank,
 #endif /* PCINT2_IDX */
 #ifdef PCINT3_IDX
             case PCINT3_IDX:
-                PCMSK3 |= (1 << pin_num);
+                PCMSK3 |= (1 << bank_idx);
                 PCICR |= (1 << PCIE3);
                 break;
 #endif /* PCINT3_IDX */