diff --git a/test/T357-index-decryption.sh b/test/T357-index-decryption.sh
index 1ac2836a..1ed5f28c 100755
--- a/test/T357-index-decryption.sh
+++ b/test/T357-index-decryption.sh
@@ -306,6 +306,9 @@ test_json_nodes <<<"$output" "$goodsig"
 
 test_begin_subtest "verify signature with stashed session key"
 output=$(notmuch show --format=json id:encrypted-signed@crypto.notmuchmail.org)
+if [ $NOTMUCH_GMIME_VERIFY_WITH_SESSION_KEY -ne 1 ]; then
+    test_subtest_known_broken
+fi
 test_json_nodes <<<"$output" "$goodsig"
 
 # TODO: test removal of a message from the message store between