diff --git a/src/Composer/Installer/BinaryInstaller.php b/src/Composer/Installer/BinaryInstaller.php
index b7b2b40ab64b..de6ca65ab8fd 100644
--- a/src/Composer/Installer/BinaryInstaller.php
+++ b/src/Composer/Installer/BinaryInstaller.php
@@ -392,7 +392,7 @@ public function url_stat(\$path, \$flags)
         return <<<PROXY
 #!/usr/bin/env sh
 
-self=\$(realpath \$0)
+self=\$(realpath \$0 >/dev/null 2>&1)
 if [ -z "\$self" ]
 then
     self="\$0"