diff --git a/src/Composer/Factory.php b/src/Composer/Factory.php
index 07211165c..485345c67 100644
--- a/src/Composer/Factory.php
+++ b/src/Composer/Factory.php
@@ -85,7 +85,7 @@ class Factory
 
         // select first dir which exists of: $XDG_CONFIG_HOME/composer or ~/.composer
         foreach ($dirs as $dir) {
-            if (is_dir($dir)) {
+            if (Silencer::call('is_dir', $dir)) {
                 return $dir;
             }
         }