diff --git a/conda/artiq/build.sh b/conda/artiq/build.sh
index 373135c22..e242eeba9 100755
--- a/conda/artiq/build.sh
+++ b/conda/artiq/build.sh
@@ -18,7 +18,7 @@ mkdir -p $BIN_PREFIX/kc705 $BIN_PREFIX/pipistrello
 
 # build for KC705
 
-PYTHONPATH=$PREFIX/lib/python3.4/site-packages
+export PYTHONPATH=$PREFIX/lib/python3.4/site-packages
 
 cd $SRC_DIR/misoc; python make.py -X ../soc -t artiq_kc705 build-headers build-bios; cd -
 make -C soc/runtime clean runtime.fbi