diff --git a/.gitignore b/.gitignore
index 1e47924e..01577f03 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,7 +14,7 @@ venv-3.5/
 */test/output
 bin/
 include/
-lib/
+ocrmypdf/lib/_*.py
 pip-selfcheck.json
 pyvenv.cfg
 htmlcov/
@@ -23,4 +23,5 @@ htmlcov/
 .ipynb_checkpoints/
 tests/cache/
 tests/resources/private
-ocrmypdf/version.py
\ No newline at end of file
+ocrmypdf/version.py
+.eggs/
\ No newline at end of file
diff --git a/ocrmypdf/leptonica.py b/ocrmypdf/leptonica.py
index 4e2eaecb..7b3fb67a 100644
--- a/ocrmypdf/leptonica.py
+++ b/ocrmypdf/leptonica.py
@@ -15,7 +15,7 @@ import os
 import logging
 from tempfile import TemporaryFile
 from ctypes.util import find_library
-from ._leptonica import ffi
+from .lib._leptonica import ffi
 
 lept = ffi.dlopen(find_library('lept'))
 
diff --git a/ocrmypdf/lept.py b/ocrmypdf/lib/compile_leptonica.py
similarity index 98%
rename from ocrmypdf/lept.py
rename to ocrmypdf/lib/compile_leptonica.py
index ed8e6295..427ffbb8 100644
--- a/ocrmypdf/lept.py
+++ b/ocrmypdf/lib/compile_leptonica.py
@@ -1,7 +1,7 @@
 from cffi import FFI
 
 ffi = FFI()
-ffi.set_source("_leptonica", None)
+ffi.set_source("ocrmypdf.lib._leptonica", None)
 ffi.cdef("""
 typedef signed char             l_int8;
 typedef unsigned char           l_uint8;
diff --git a/setup.py b/setup.py
index c141ee43..2e21cc1d 100644
--- a/setup.py
+++ b/setup.py
@@ -206,9 +206,13 @@ setup(
         "Topic :: Text Processing :: Linguistic",
         ],
     setup_requires=[
-        'setuptools_scm'
+        'setuptools_scm',
+        'cffi>=1.0.0'
     ],
     use_scm_version={'version_scheme': 'post-release'},
+    cffi_modules=[
+        'ocrmypdf/lib/compile_leptonica.py:ffi'
+    ],
     install_requires=[
         'ruffus',
         'Pillow',