diff --git a/src/mimeparser.rs b/src/mimeparser.rs
index 35fcf9f5f..867da587c 100644
--- a/src/mimeparser.rs
+++ b/src/mimeparser.rs
@@ -1386,6 +1386,7 @@ impl MimeMessage {
 
     fn remove_secured_headers(headers: &mut HashMap<String, String>) {
         headers.remove("secure-join-fingerprint");
+        headers.remove("secure-join-auth");
         headers.remove("chat-verified");
         headers.remove("autocrypt-gossip");