diff --git a/auto_config.sh b/auto_config.sh
index 716909e..02c611e 100755
--- a/auto_config.sh
+++ b/auto_config.sh
@@ -125,15 +125,15 @@ apt-get -y install      \
 UNA_FILE="/etc/apt/apt.conf.d/50unattended-upgrades"
 # email setting
 if ! grep -q '^Unattended-Upgrade::Mail ' $UNA_FILE ; then
-    echo "Unattended-Upgrade::Mail '$UNATTENDED_EMAIL';" >> $UNA_FILE
+    echo "Unattended-Upgrade::Mail \"$UNATTENDED_EMAIL\";" >> $UNA_FILE
 else
     sed -i "s/Unattended-Upgrade::Mail .*/Unattended-Upgrade::Mail '$UNATTENDED_EMAIL';/" $UNA_FILE
 fi
 # MailOnlyOnError
 if ! grep -q '^Unattended-Upgrade::MailOnlyOnError ' $UNA_FILE ; then
-    echo "Unattended-Upgrade::MailOnlyOnError 'true';" >> $UNA_FILE
+    echo "Unattended-Upgrade::MailOnlyOnError \"true\";" >> $UNA_FILE
 else
-    sed -i "s/Unattended-Upgrade::MailOnlyOnError .*/Unattended-Upgrade::MailOnlyOnError 'true';/" $UNA_FILE
+    sed -i "s/Unattended-Upgrade::MailOnlyOnError .*/Unattended-Upgrade::MailOnlyOnError \"true\";/" $UNA_FILE
 fi
 
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