diff --git a/rebootSchedule.sh b/rebootSchedule.sh
index b10d4cd..274abfc 100644
--- a/rebootSchedule.sh
+++ b/rebootSchedule.sh
@@ -10,11 +10,11 @@ REST=("dt03" "git01" "run01" "has01" "iam01" "man01" "mdm01" "minecraft" "nms01"
 ############################################
 # 1:00h (uit crontab)                FIRST #
 ############################################
-for SERVER in ${FIRST[@]}; do
+for SERVER in "${FIRST[@]}"; do
   echo "------------------------------------"
   date +"%H:%M:%S %d-%m-%Y"
-  echo Starting reboot of $SERVER
-  ssh $SERVER reboot now
+  echo "Starting reboot of $SERVER"
+  ssh "$SERVER" reboot now
   sleep 60
 done
 
@@ -23,15 +23,15 @@ done
 ############################################
 timeNow=$(date +%s)
 targetTime=$(date -d 01:15 +%s)
-timeToWait=$(($targetTime - $timeNow))
-echo Waiting $timeToWait seconds
-sleep $timeToWait
+timeToWait=($targetTime - $timeNow)
+echo "Waiting $timeToWait seconds"
+sleep "$timeToWait"
 
-for SERVER in ${SECOND[@]}; do
+for SERVER in "${SECOND[@]}"; do
   echo "------------------------------------"
   date +"%H:%M:%S %d-%m-%Y"
-  echo Starting reboot of $SERVER
-  ssh $SERVER reboot now
+  echo "Starting reboot of $SERVER"
+  ssh "$SERVER" reboot now
   sleep 60
 done
 
@@ -40,15 +40,15 @@ done
 ############################################
 timeNow=$(date +%s)
 targetTime=$(date -d 01:30 +%s)
-timeToWait=$(($targetTime - $timeNow))
-echo Waiting $timeToWait seconds
+timeToWait=($targetTime - $timeNow)
+echo "Waiting $timeToWait seconds"
 sleep $timeToWait
 
-for SERVER in ${THIRD[@]}; do
+for SERVER in "${THIRD[@]}"; do
   echo "------------------------------------"
   date +"%H:%M:%S %d-%m-%Y"
-  echo Starting reboot of $SERVER
-  ssh $SERVER reboot now
+  echo "Starting reboot of $SERVER"
+  ssh "$SERVER" reboot now
 done
 
 ############################################
@@ -56,15 +56,15 @@ done
 ############################################
 timeNow=$(date +%s)
 targetTime=$(date -d 01:45 +%s)
-timeToWait=$(($targetTime - $timeNow))
-echo Waiting $timeToWait seconds
+timeToWait=($targetTime - $timeNow)
+echo "Waiting $timeToWait seconds"
 sleep $timeToWait
 
-for SERVER in ${REST[@]}; do
+for SERVER in "${REST[@]}"; do
   echo "------------------------------------"
   date +"%H:%M:%S %d-%m-%Y"
-  echo Starting reboot of $SERVER
-  ssh $SERVER reboot now
+  echo "Starting reboot of $SERVER"
+  ssh "$SERVER" reboot now
 done
 
 ############################################
@@ -72,10 +72,10 @@ done
 ############################################
 timeNow=$(date +%s)
 targetTime=$(date -d 01:55 +%s)
-timeToWait=$(($targetTime - $timeNow))
-echo Waiting $timeToWait seconds
+timeToWait=($targetTime - $timeNow)
+echo "Waiting $timeToWait seconds"
 sleep $timeToWait
 echo "------------------------------------"
 date +"%H:%M:%S %d-%m-%Y"
-echo Starting reboot of $(hostname)
+echo "Starting reboot of $(hostname)"
 shutdown -r 5 "Reboot in 5 minutes."