diff --git a/src/ocrmypdf/pluginspec.py b/src/ocrmypdf/pluginspec.py
index 1078eeaf..8d485bf1 100644
--- a/src/ocrmypdf/pluginspec.py
+++ b/src/ocrmypdf/pluginspec.py
@@ -197,7 +197,7 @@ def rasterize_pdf_page(
 
 
 @hookspec(firstresult=True)
-def filter_ocr_image(page: 'PageContext', image: Image.Image) -> Image.Image:
+def filter_ocr_image(page: 'PageContext', image: 'Image.Image') -> 'Image.Image':
     """Called to filter the image before it is sent to OCR.
 
     This is the image that OCR sees, not what the user sees when they view the
diff --git a/tests/test_page_numbers.py b/tests/test_page_numbers.py
index 71f06a0d..d89a3bea 100644
--- a/tests/test_page_numbers.py
+++ b/tests/test_page_numbers.py
@@ -50,10 +50,6 @@ def test_nonmonotonic_warning(caplog):
     assert 'out of order' in caplog.text
 
 
-def test_list_range():
-    assert _pages_from_ranges([0, 1, 2]) == {0, 1, 2}
-
-
 def test_limited_pages(resources, outpdf):
     multi = resources / 'multipage.pdf'
     ocrmypdf.ocr(