diff --git a/mantidimaging/gui/widgets/spectrum_widgets/__init__.py b/mantidimaging/gui/widgets/spectrum_widgets/__init__.py
new file mode 100644
index 00000000000..3bf970a700e
--- /dev/null
+++ b/mantidimaging/gui/widgets/spectrum_widgets/__init__.py
@@ -0,0 +1,3 @@
+# Copyright (C) 2021 ISIS Rutherford Appleton Laboratory UKRI
+# SPDX - License - Identifier: GPL-3.0-or-later
+from __future__ import annotations