diff --git a/src/Composer/Installer/BinaryInstaller.php b/src/Composer/Installer/BinaryInstaller.php
index ba50fe17f..43254af61 100644
--- a/src/Composer/Installer/BinaryInstaller.php
+++ b/src/Composer/Installer/BinaryInstaller.php
@@ -401,7 +401,7 @@ if [ -n "\$bashSource" ]; then
     fi
 fi
 
-"\${dir}/$binFile" "\$@"
+sh "\${dir}/$binFile" "\$@"
 
 PROXY;
     }