diff --git a/sw/airborne/firmwares/fixedwing/main_ap.c b/sw/airborne/firmwares/fixedwing/main_ap.c
index 6b03f30b40..5959b958fc 100644
--- a/sw/airborne/firmwares/fixedwing/main_ap.c
+++ b/sw/airborne/firmwares/fixedwing/main_ap.c
@@ -658,7 +658,7 @@ void monitor_task( void ) {
 void event_task_ap( void ) {
 
 #ifndef SINGLE_MCU
-#if USE_I2C0  || USE_I2C1  || USE_I2C2
+#if USE_I2C0 || USE_I2C1 || USE_I2C2 || USE_I2C3
   i2c_event();
 #endif
 #endif
diff --git a/sw/airborne/mcu.c b/sw/airborne/mcu.c
index c1a04c5607..ceff10a868 100644
--- a/sw/airborne/mcu.c
+++ b/sw/airborne/mcu.c
@@ -41,7 +41,7 @@
 #if USE_UART0 || USE_UART1 || USE_UART2 || USE_UART3 || USE_UART4 || USE_UART5 || USE_UART6
 #include "mcu_periph/uart.h"
 #endif
-#if USE_I2C0 || USE_I2C1 || USE_I2C2
+#if USE_I2C0 || USE_I2C1 || USE_I2C2 || USE_I2C3
 #include "mcu_periph/i2c.h"
 #endif
 #if USE_ADC