diff --git a/libraries/AP_HAL_PX4/Util.cpp b/libraries/AP_HAL_PX4/Util.cpp
index 6d60857ebb..ef3aa18330 100644
--- a/libraries/AP_HAL_PX4/Util.cpp
+++ b/libraries/AP_HAL_PX4/Util.cpp
@@ -242,8 +242,7 @@ extern "C" {
 */
 void *PX4Util::dma_allocate(size_t size)
 {
-#if !defined(CONFIG_ARCH_BOARD_PX4FMU_V1) && \
-    !defined(CONFIG_ARCH_BOARD_AEROFC_V1)
+#if !defined(CONFIG_ARCH_BOARD_PX4FMU_V1)
     return fat_dma_alloc(size);
 #else
     return malloc(size);
@@ -251,8 +250,7 @@ void *PX4Util::dma_allocate(size_t size)
 }
 void PX4Util::dma_free(void *ptr, size_t size)
 {
-#if !defined(CONFIG_ARCH_BOARD_PX4FMU_V1) && \
-    !defined(CONFIG_ARCH_BOARD_AEROFC_V1)
+#if !defined(CONFIG_ARCH_BOARD_PX4FMU_V1)
     fat_dma_free(ptr, size);
 #else
     return free(ptr);
diff --git a/libraries/AP_InertialSensor/AP_InertialSensor.cpp b/libraries/AP_InertialSensor/AP_InertialSensor.cpp
index db9b57a673..b1334c43e4 100644
--- a/libraries/AP_InertialSensor/AP_InertialSensor.cpp
+++ b/libraries/AP_InertialSensor/AP_InertialSensor.cpp
@@ -743,6 +743,7 @@ AP_InertialSensor::detect_backends(void)
         break;
 
     case AP_BoardConfig::PX4_BOARD_AEROFC:
+        _fast_sampling_mask.set_default(1);
         _add_backend(AP_InertialSensor_Invensense::probe(*this, hal.spi->get_device(HAL_INS_MPU6500_NAME), ROTATION_YAW_270));
         break;