diff --git a/lib/configonlylib.php b/lib/configonlylib.php
index 8192704259d..36af200b59b 100644
--- a/lib/configonlylib.php
+++ b/lib/configonlylib.php
@@ -142,14 +142,14 @@ function min_enable_zlib_compression() {
 
     // zlib.output_compression is preferred over ob_gzhandler()
     if (!empty($_SERVER['HTTP_USER_AGENT']) and strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE 6') !== false) {
-        @ini_set('zlib.output_compression', 'Off');
+        ini_set('zlib.output_compression', 'Off');
         if (function_exists('apache_setenv')) {
-            @apache_setenv('no-gzip', 1);
+            apache_setenv('no-gzip', 1);
         }
         return false;
     }
 
-    @ini_set('output_handler', '');
+    ini_set('output_handler', '');
 
     /*
      * docs clearly say 'on' means enable and number means size of buffer,
@@ -157,7 +157,7 @@ function min_enable_zlib_compression() {
      * 1 probably sets chunk size to 4096. our CSS and JS scripts are much bigger,
      * so let's try some bigger sizes.
      */
-    @ini_set('zlib.output_compression', 65536);
+    ini_set('zlib.output_compression', 65536);
 
     return true;
 }
diff --git a/lib/filelib.php b/lib/filelib.php
index ebdd06c8d2b..bae53e0bb01 100644
--- a/lib/filelib.php
+++ b/lib/filelib.php
@@ -2672,7 +2672,7 @@ function fulldelete($location) {
  */
 function byteserving_send_file($handle, $mimetype, $ranges, $filesize) {
     // better turn off any kind of compression and buffering
-    @ini_set('zlib.output_compression', 'Off');
+    ini_set('zlib.output_compression', 'Off');
 
     $chunksize = 1*(1024*1024); // 1MB chunks - must be less than 2MB!
     if ($handle === false) {
diff --git a/lib/setup.php b/lib/setup.php
index f1d3054e4fd..803782803f8 100644
--- a/lib/setup.php
+++ b/lib/setup.php
@@ -985,9 +985,9 @@ if (PHPUNIT_TEST) {
 
 // // try to detect IE6 and prevent gzip because it is extremely buggy browser
 if (!empty($_SERVER['HTTP_USER_AGENT']) and strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE 6') !== false) {
-    @ini_set('zlib.output_compression', 'Off');
+    ini_set('zlib.output_compression', 'Off');
     if (function_exists('apache_setenv')) {
-        @apache_setenv('no-gzip', 1);
+        apache_setenv('no-gzip', 1);
     }
 }