diff --git a/ChangeLog b/ChangeLog
index eb6bcbb0e3..4030646344 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -2,6 +2,7 @@ phpMyAdmin - ChangeLog
 ======================
 
 4.2.5.0 (not yet released)
+- bug #4467 shell_exec() has been disabled for security reasons
 
 4.2.4.0 (2014-06-20)
 - bug #4449 Mediawiki export does not produce table header row; also fix related PHP warnings
diff --git a/libraries/DisplayResults.class.php b/libraries/DisplayResults.class.php
index d5f54bd21e..b1c6f24da2 100644
--- a/libraries/DisplayResults.class.php
+++ b/libraries/DisplayResults.class.php
@@ -2039,9 +2039,9 @@ class PMA_DisplayResults
         foreach ($sort_expression_nodirection as $index => $clause) {
             if (strpos($clause, '.') !== false) {
                 $fragments = explode('.', $clause);
-                $clause2 = $fragments[0] . "." . str_replace('`', ``, $fragments[1]);
+                $clause2 = $fragments[0] . "." . str_replace('`', '', $fragments[1]);
             } else {
-                $clause2 = $sort_tbl . str_replace('`', ``, $clause);
+                $clause2 = $sort_tbl . str_replace('`', '', $clause);
             }
             if ($clause2 === $sort_tbl . $name_to_use_in_sort) {
                 $index_in_expression = $index;