diff --git a/library/ajax/edit_user_profile.php b/library/ajax/edit_user_profile.php
index 62f0f8702..a2d5b74b8 100644
--- a/library/ajax/edit_user_profile.php
+++ b/library/ajax/edit_user_profile.php
@@ -128,7 +128,7 @@ switch ($field) {
 
         foreach (array('KB' => 1, 'MB' => 2, 'GB' => 3, 'TB' => 4) as $s => $m) {
             if (strpos($this->request['value'], $s) !== false) {
-                $value *= pow(1024, $m);
+                $value *= (1024 ** $m);
                 break;
             }
         }
diff --git a/library/attach_mod/includes/functions_attach.php b/library/attach_mod/includes/functions_attach.php
index 40f407bd9..04ac91a59 100644
--- a/library/attach_mod/includes/functions_attach.php
+++ b/library/attach_mod/includes/functions_attach.php
@@ -68,7 +68,7 @@ function base64_unpack($string)
     for ($i = 1; $i <= $length; $i++) {
         $pos = $length - $i;
         $operand = strpos($chars, $string[$pos]);
-        $exponent = pow($base, $i - 1);
+        $exponent = $base ** ($i - 1);
         $decValue = $operand * $exponent;
         $number += $decValue;
     }