diff --git a/flix/imu.ino b/flix/imu.ino
index 45ba006..9fbde5f 100644
--- a/flix/imu.ino
+++ b/flix/imu.ino
@@ -5,6 +5,7 @@
 
 #include <SPI.h>
 #include <FlixPeriph.h>
+#include "vector.h"
 #include "lpf.h"
 #include "util.h"
 
diff --git a/flix/parameters.ino b/flix/parameters.ino
index 494c571..ef2f6a3 100644
--- a/flix/parameters.ino
+++ b/flix/parameters.ino
@@ -8,7 +8,6 @@
 extern float channelZero[16];
 extern float channelMax[16];
 extern float rollChannel, pitchChannel, throttleChannel, yawChannel, armedChannel, modeChannel;
-extern float mavlinkControlScale;
 
 Preferences storage;