diff --git a/src/ocrmypdf/_optimize.py b/src/ocrmypdf/optimize.py
similarity index 100%
rename from src/ocrmypdf/_optimize.py
rename to src/ocrmypdf/optimize.py
diff --git a/src/ocrmypdf/pipeline.py b/src/ocrmypdf/pipeline.py
index 7f9e1b91..72d5e296 100644
--- a/src/ocrmypdf/pipeline.py
+++ b/src/ocrmypdf/pipeline.py
@@ -40,7 +40,7 @@ from .exceptions import PdfMergeFailedError, UnsupportedImageFormatError, \
     DpiError, PriorOcrFoundError, InputFileError
 from . import leptonica
 from . import PROGRAM_NAME, VERSION
-from ._optimize import optimize
+from .optimize import optimize
 from ._weave import weave_layers
 
 
diff --git a/tests/test_optimize.py b/tests/test_optimize.py
index 0a30dce2..586ff45f 100644
--- a/tests/test_optimize.py
+++ b/tests/test_optimize.py
@@ -21,7 +21,7 @@ import pytest
 
 import pikepdf
 
-from ocrmypdf import _optimize as opt
+from ocrmypdf import optimize as opt
 
 
 @pytest.mark.parametrize('pdf', ['multipage.pdf', 'palette.pdf'])