diff --git a/evomaintenance.sh b/evomaintenance.sh
index 3c52aa3..cee64b3 100755
--- a/evomaintenance.sh
+++ b/evomaintenance.sh
@@ -81,7 +81,7 @@ get_who() {
     if [ -n "${who}" ]; then
         echo "${who}"
     else
-        LC_ALL=C who | grep $(get_tty) | tr -s ' '
+        LC_ALL=C who | grep "$(get_tty)" | tr -s ' '
     fi
 }