diff --git a/program/lib/Auth/SASL/DigestMD5.php b/program/lib/Auth/SASL/DigestMD5.php
index f201622a2..07007b7c9 100644
--- a/program/lib/Auth/SASL/DigestMD5.php
+++ b/program/lib/Auth/SASL/DigestMD5.php
@@ -178,10 +178,10 @@ class Auth_SASL_DigestMD5 extends Auth_SASL_Common
     */
     function _getCnonce()
     {
-        if (file_exists('/dev/urandom') && $fd = @fopen('/dev/urandom', 'r')) {
+        if (@file_exists('/dev/urandom') && $fd = @fopen('/dev/urandom', 'r')) {
             return base64_encode(fread($fd, 32));
 
-        } elseif (file_exists('/dev/random') && $fd = @fopen('/dev/random', 'r')) {
+        } elseif (@file_exists('/dev/random') && $fd = @fopen('/dev/random', 'r')) {
             return base64_encode(fread($fd, 32));
 
         } else {