diff --git a/makefiles/config_px4fmu-v2_test.mk b/makefiles/config_px4fmu-v2_test.mk
index 66d9efbf8c..395a8f2ace 100644
--- a/makefiles/config_px4fmu-v2_test.mk
+++ b/makefiles/config_px4fmu-v2_test.mk
@@ -42,6 +42,7 @@ MODULES		+= modules/uORB
 LIBRARIES	+= lib/mathlib/CMSIS
 MODULES		+= lib/mathlib
 MODULES		+= lib/mathlib/math/filter
+MODULES		+= lib/conversion
 
 #
 # Libraries
diff --git a/src/drivers/boards/px4fmu-v1/board_config.h b/src/drivers/boards/px4fmu-v1/board_config.h
index c944007a56..a70a6240cb 100644
--- a/src/drivers/boards/px4fmu-v1/board_config.h
+++ b/src/drivers/boards/px4fmu-v1/board_config.h
@@ -86,7 +86,6 @@ __BEGIN_DECLS
 #define GPIO_SPI_CS_SDCARD	(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_50MHz|GPIO_OUTPUT_SET|GPIO_PORTA|GPIO_PIN4)
 
 #define PX4_SPI_BUS_SENSORS	1
-#define PX4_SPI_BUS_EXT		2
 
 /*
  * Use these in place of the spi_dev_e enumeration to