diff --git a/src/vmm_mad/remotes/vcenter/attach_disk b/src/vmm_mad/remotes/vcenter/attach_disk
index 6b79f6b530..541a9a0ad4 100755
--- a/src/vmm_mad/remotes/vcenter/attach_disk
+++ b/src/vmm_mad/remotes/vcenter/attach_disk
@@ -30,13 +30,13 @@ $LOAD_PATH << File.dirname(__FILE__)
 require 'vcenter_driver'
 
 vm_ref         = ARGV[0]
-drv_action_enc = ARGV[4]
 
 drv_action = OpenNebula::XMLElement.new
-drv_action.initialize_xml(Base64.decode64(drv_action_enc),
-                          'VMM_DRIVER_ACTION_DATA')
 
-host_id = drv_action['VM/HISTORY_RECORDS/HISTORY/HID']
+# Read from STDIN instead of ARGV[4] to avoid broken pipe error
+drv_action.initialize_xml(Base64.decode64(STDIN.read), 'VMM_DRIVER_ACTION_DATA')
+
+host_id = drv_action['/VMM_DRIVER_ACTION_DATA/VM/HISTORY_RECORDS/HISTORY/HID']
 
 vc_cluster_name = drv_action['/VMM_DRIVER_ACTION_DATA/HOST']