diff --git a/tests/simexec.sh b/tests/simexec.sh
index 31b8bcdf87581b86c6597020771fb51a5631bbfb..b1dc20a57f0288879157e935dcde8a269391b8bb 100755
--- a/tests/simexec.sh
+++ b/tests/simexec.sh
@@ -28,7 +28,7 @@ for (( SEED=$BASESEED; SEED<$(($BASESEED+$RUNCOUNT)); SEED++ )); do
 	echo -n "Running test $BASENAME with random Seed $SEED"
 
 	# run simulation
-	java -Xshare:on -jar $CONTIKI/tools/cooja/dist/cooja.jar -nogui=$CSC -contiki=$CONTIKI -random-seed=$SEED > $BASENAME.$SEED.coojalog &
+	java -Xshare:on -Dnashorn.args=--no-deprecation-warning -jar $CONTIKI/tools/cooja/dist/cooja.jar -nogui=$CSC -contiki=$CONTIKI -random-seed=$SEED > $BASENAME.$SEED.coojalog &
 	JPID=$!
 
 	# Copy the log and only print "." if it changed