diff --git a/runOver9P.sh b/runOver9P.sh
index edddc42..0183fe5 100755
--- a/runOver9P.sh
+++ b/runOver9P.sh
@@ -17,7 +17,7 @@ $JEHANNE/hacking/bin/nc -p 5640 -l -e $JEHANNE/hacking/bin/start-u9fs.sh &
 ufspid=$!
 
 export machineflag=pc
-if [ "$(uname)" = "Linux" ] && [ -e /dev/kvm ]; then
+if [ "$JEHANNE_KVM" = "enable" ] && [ "$(uname)" = "Linux" ] && [ -e /dev/kvm ]; then
         export kvmflag='-enable-kvm'
         export machineflag='pc,accel=kvm'
         if [ ! -w /dev/kvm ]; then