diff --git a/setup.py b/setup.py
index 62d6384..06c19dd 100644
--- a/setup.py
+++ b/setup.py
@@ -87,11 +87,10 @@ else:
     patch_lmdb_source = True
 
 if patch_lmdb_source:
-    if sys.platform.startswith('win'):
-        try:
-            import patch_ng as patch
-        except ImportError:
-            raise Exception('Building py-lmdb from source on Windows requires the "patch-ng" python module.')
+    try:
+        import patch_ng as patch
+    except ImportError:
+        raise Exception('Building py-lmdb from source requires the "patch-ng" python module.')
 
     # Clean out any previously patched files
     dest = 'build' + os.sep + 'lib'
@@ -107,16 +106,11 @@ if patch_lmdb_source:
     shutil.copytree('lib', dest)
 
     # Copy away the lmdb source then patch it
-    if sys.platform.startswith('win'):
-        patchfile = 'lib' + os.sep + 'py-lmdb' + os.sep + 'env-copy-txn.patch'
-        patchset = patch.fromfile(patchfile)
-        rv = patchset.apply(3, root=dest)
-        if not rv:
-            raise Exception('Applying patch failed')
-    else:
-        rv = os.system('/usr/bin/patch -N -p3 -d build/lib < lib/py-lmdb/env-copy-txn.patch')
-        if rv:
-            raise Exception('Applying patch failed')
+    patchfile = 'lib' + os.sep + 'py-lmdb' + os.sep + 'env-copy-txn.patch'
+    patchset = patch.fromfile(patchfile)
+    rv = patchset.apply(3, root=dest)
+    if not rv:
+        raise Exception('Applying patch failed')
 
 # distutils perplexingly forces NDEBUG for package code!
 extra_compile_args += ['-UNDEBUG']