diff --git a/include/msglib.php b/include/msglib.php
index e69de29bb..c55839f6c 100644
--- a/include/msglib.php
+++ b/include/msglib.php
@@ -0,0 +1,35 @@
+<?php
+
+/* Common private message processing functions */
+
+function msg_drop($message_id, $channel_id, $conv_guid) {
+
+    // Delete message
+    $r = q("DELETE FROM mail WHERE id = %d AND channel_id = %d",
+		$message_id,
+		$channel_id
+	);
+
+	// If it was a first message in thread
+	$z = q("SELECT * FROM mail WHERE mid = '%s' AND channel_id = %d",
+		$message_id,
+		$channel_id
+	);
+	if (! $z) {
+	    // Get new first message...
+	    $r = q("SELECT mid FROM mail WHERE conv_guid = '%s' AND channel_id = %d ORDER BY id ASC LIMIT 1",
+		    $conv_guid,
+		    $channel_id
+	    );
+	    // ...and refer whole thread to it
+	    q("UPDATE mail SET parent_mid = '%s', mail_isreply = abs(mail_isreply - 1) WHERE conv_guid = '%s' AND channel_id = %d",
+	        dbesc($r[0]['mid']),
+	        $conv_guid,
+	        $channel_id
+	    );
+	    return true;
+	} else {
+	    return false;
+	}
+
+}