diff --git a/Tools/scripts/build_autotest.sh b/Tools/scripts/build_autotest.sh
index baea921487..0202aae18f 100755
--- a/Tools/scripts/build_autotest.sh
+++ b/Tools/scripts/build_autotest.sh
@@ -2,6 +2,7 @@
 
 export PATH=/usr/local/bin:$HOME/prefix/bin:$HOME/APM/px4/gcc-arm-none-eabi-4_6-2012q2/bin:$PATH
 export PYTHONUNBUFFERED=1
+export PYTHONPATH=$HOME/APM
 export PX4_ROOT=$HOME/APM/px4/PX4Firmware
 
 cd $HOME/APM || exit 1