diff --git a/src/freedombone-ignore b/src/freedombone-ignore
index bfe2194d..a9f05a01 100755
--- a/src/freedombone-ignore
+++ b/src/freedombone-ignore
@@ -78,7 +78,7 @@ MUTTRC=/home/$MYUSERNAME/.muttrc
 PM=/home/$MYUSERNAME/.procmailrc
 
 # Ignore if subject line contains text
-if [ $SUBJECT_TEXT ]; then
+if [ "$SUBJECT_TEXT" ]; then
     if ! grep -q "Ignore rule for $SUBJECT_TEXT" $PM; then
         echo "# Ignore rule for $SUBJECT_TEXT" >> $PM
         echo ":0" >> $PM