diff --git a/mysqltuner.pl b/mysqltuner.pl
index a256a34..f610bab 100755
--- a/mysqltuner.pl
+++ b/mysqltuner.pl
@@ -1690,7 +1690,7 @@ sub security_recommendations {
 
     my $PASS_COLUMN_NAME = 'password';
     if ( $myvar{'version'} =~ /5\.7|10\..*MariaDB*/ ) {
-        $PASS_COLUMN_NAME = 'IF(plugin=\'mysql_native_password\', authentication_string, password)';
+        $PASS_COLUMN_NAME = "IF(plugin='mysql_native_password', authentication_string, password)";
     }
     debugprint "Password column = $PASS_COLUMN_NAME";