diff --git a/src/platforms/px4_micro_hal.h b/src/platforms/px4_micro_hal.h
index 1a945553d0..d992ba16c3 100644
--- a/src/platforms/px4_micro_hal.h
+++ b/src/platforms/px4_micro_hal.h
@@ -136,6 +136,7 @@ __BEGIN_DECLS
 #    // Fixme: using ??
 #    define PX4_BBSRAM_SIZE          2048
 #    define PX4_BBSRAM_GETDESC_IOCTL 0
+#    define PX4_NUMBER_I2C_BUSES     KINETIS_NI2C
 
 #    define GPIO_OUTPUT_SET          GPIO_OUTPUT_ONE
 #    define GPIO_OUTPUT_CLEAR        GPIO_OUTPUT_ZER0