diff --git a/netpfga/build-load-drivers.sh b/netpfga/build-load-drivers.sh
index 60b6f09..5dcd374 100644
--- a/netpfga/build-load-drivers.sh
+++ b/netpfga/build-load-drivers.sh
@@ -3,7 +3,8 @@
 set -e
 set -x
 
-cd $DRIVER_FOLDER
+cd "$DRIVER_FOLDER"
+make clean
 make all
 sudo make install
 sudo modprobe sume_riffa