diff --git a/src/Composer/Installer/BinaryInstaller.php b/src/Composer/Installer/BinaryInstaller.php
index 91479bf58..e33a5061c 100644
--- a/src/Composer/Installer/BinaryInstaller.php
+++ b/src/Composer/Installer/BinaryInstaller.php
@@ -406,7 +406,7 @@ if [ -n "\$bashSource" ]; then
     fi
 fi
 
-sh "\${dir}/$binFile" "\$@"
+"\${dir}/$binFile" "\$@"
 
 PROXY;
     }