diff --git a/service/test/agama/storage/manager_test.rb b/service/test/agama/storage/manager_test.rb
index ed357566b..4b8b665d8 100644
--- a/service/test/agama/storage/manager_test.rb
+++ b/service/test/agama/storage/manager_test.rb
@@ -55,6 +55,8 @@
     allow(Agama::DBus::Clients::Software).to receive(:instance).and_return(software)
     allow(Bootloader::FinishClient).to receive(:new).and_return(bootloader_finish)
     allow(Agama::Security).to receive(:new).and_return(security)
+    # mock writting config as proposal call can do storage probing, which fails in CI
+    allow_any_instance_of(Agama::Storage::Bootloader).to receive(:write_config)
     allow(Agama::HTTP::Clients::Scripts).to receive(:new).and_return(scripts_client)
     allow(Yast::Installation).to receive(:destdir).and_return(File.join(tmp_dir, "mnt"))
     stub_const("Agama::Storage::Finisher::CopyLogsStep::SCRIPTS_DIR",