diff --git a/debian/tests/system-test b/debian/tests/system-test
index 4811b19e..86311992 100755
--- a/debian/tests/system-test
+++ b/debian/tests/system-test
@@ -30,6 +30,7 @@ disable_test t07_serve/serve Serve1Test "minor html diff"
 disable_test t09_repo/edit EditRepo4Test "flaky on riscv64"
 disable_test t10_task/run RunTask1Test "version"
 disable_test t12_api/docs TaskAPITestSwaggerDocs "no recent swag"
+disable_test t12_api/gpg GPGAPITestAddKey "flaky on s390"
 disable_test t12_api/unix_socket UnixSocketAPITest "type mismatch"
 disable_test t12_api/version VersionAPITest "type mismatch"
 disable_test t14_graph/graph CreateGraphTest "no viewer"