diff --git a/linux/evocheck.sh b/linux/evocheck.sh
index c057157..12838b2 100755
--- a/linux/evocheck.sh
+++ b/linux/evocheck.sh
@@ -159,10 +159,10 @@ check_postfix_mydestination() {
     if ! grep mydestination /etc/postfix/main.cf | grep --quiet -E 'localhost([[:blank:]]|$)'; then
         failed "IS_POSTFIX_MYDESTINATION" "'localhost' is missing in Postfix mydestination option."
     fi
-    if ! grep mydestination /etc/postfix/main.cf | grep --quiet 'localhost\.localdomain'; then
+    if ! grep mydestination /etc/postfix/main.cf | grep --quiet --fixed-strings 'localhost.localdomain'; then
         failed "IS_POSTFIX_MYDESTINATION" "'localhost.localdomain' is missing in Postfix mydestination option."
     fi
-    if ! grep mydestination /etc/postfix/main.cf | grep --quiet 'localhost\.\$mydomain'; then
+    if ! grep mydestination /etc/postfix/main.cf | grep --quiet --fixed-strings 'localhost.$mydomain'; then
         failed "IS_POSTFIX_MYDESTINATION" "'localhost.\$mydomain' is missing in Postfix mydestination option."
     fi
 }