diff --git a/src/Composer/Command/DiagnoseCommand.php b/src/Composer/Command/DiagnoseCommand.php
index 8c39a61bd..57ed3a003 100644
--- a/src/Composer/Command/DiagnoseCommand.php
+++ b/src/Composer/Command/DiagnoseCommand.php
@@ -219,8 +219,8 @@ EOT
     private function checkDiskSpace($config)
     {
         $minSpaceFree = 1024*1024;
-        if ((($df = disk_free_space($dir = $config->get('home'))) !== false && $df < $minSpaceFree)
-            || (($df = disk_free_space($dir = $config->get('vendor-dir'))) !== false && $df < $minSpaceFree)
+        if ((($df = @disk_free_space($dir = $config->get('home'))) !== false && $df < $minSpaceFree)
+            || (($df = @disk_free_space($dir = $config->get('vendor-dir'))) !== false && $df < $minSpaceFree)
         ) {
             return '<error>The disk hosting '.$dir.' is full</error>';
         }
diff --git a/src/Composer/Console/Application.php b/src/Composer/Console/Application.php
index 5b81b474b..eaef4029d 100755
--- a/src/Composer/Console/Application.php
+++ b/src/Composer/Console/Application.php
@@ -152,8 +152,8 @@ class Application extends BaseApplication
                 $config = $composer->getConfig();
 
                 $minSpaceFree = 1024*1024;
-                if ((($df = disk_free_space($dir = $config->get('home'))) !== false && $df < $minSpaceFree)
-                    || (($df = disk_free_space($dir = $config->get('vendor-dir'))) !== false && $df < $minSpaceFree)
+                if ((($df = @disk_free_space($dir = $config->get('home'))) !== false && $df < $minSpaceFree)
+                    || (($df = @disk_free_space($dir = $config->get('vendor-dir'))) !== false && $df < $minSpaceFree)
                 ) {
                     $output->writeln('<error>The disk hosting '.$dir.' is full, this may be the cause of the following exception</error>');
                 }