diff --git a/scripts/xp-instance-runner b/scripts/xp-instance-runner
index 7e0a996..892b308 100755
--- a/scripts/xp-instance-runner
+++ b/scripts/xp-instance-runner
@@ -10,7 +10,7 @@ INTERVAL=$3
 SIZE=$4
 ALLOWED_BOOTSTRAP=190
 ALLOWED_TIME=`expr $(expr ${COUNT} * ${INTERVAL}) / 1000 + ${ALLOWED_BOOTSTRAP}`
-echo "Will run for ${ALLOWED_TIME} (count=$COUNT, interval=$INTERVAL)"
+echo "Will run for ${ALLOWED_TIME} (count=$1, interval=$2)"
 
 # Create folders
 docker run \
@@ -24,11 +24,12 @@ docker run \
 docker run \
   --privileged \
   --rm \
+  -d \
   --name "$XP_ID-server" \
   -v `pwd`/shared:/home/donar/shared \
   -v `pwd`/log:/home/donar/log \
   registry.gitlab.inria.fr/qdufour/donar \
-  ${XP_NAME}-server &
+  ${XP_NAME}-server
 
 sleep 10
 
@@ -36,12 +37,13 @@ sleep 10
 docker run \
   --privileged \
   --rm \
+  -d \
   --name "$XP_ID-client" \
   -v `pwd`/res:/home/donar/res \
   -v `pwd`/shared:/home/donar/shared \
   -v `pwd`/log:/home/donar/log \
   registry.gitlab.inria.fr/qdufour/donar \
-  ${XP_NAME}-client $COUNT $INTERVAL $SIZE &
+  ${XP_NAME}-client $COUNT $INTERVAL $SIZE
 
 sleep $ALLOWED_TIME