diff --git a/snappymail/v/0.0.0/app/libraries/snappymail/pgp/gpg.php b/snappymail/v/0.0.0/app/libraries/snappymail/pgp/gpg.php
index 0173febe7..eb02644f7 100644
--- a/snappymail/v/0.0.0/app/libraries/snappymail/pgp/gpg.php
+++ b/snappymail/v/0.0.0/app/libraries/snappymail/pgp/gpg.php
@@ -60,6 +60,7 @@ class GPG
 		$passphrases = [],
 
 		$proc_resource,
+		$_openPipes, // GpgProcPipes
 
 		$armor = true,