1 files changed, 2 insertions, 1 deletions
diff --git a/setup.py b/setup.py
index d3fd7bc..8a4abe5 100644
--- a/setup.py
+++ b/setup.py
@@ -878,7 +878,8 @@ class PyBuildExt(build_ext):
         self.add(Extension('_lsprof', ['_lsprof.c', 'rotatingtree.c']))
         # static Unicode character database
         self.add(Extension('unicodedata', ['unicodedata.c'],
-                           depends=['unicodedata_db.h', 'unicodename_db.h']))
+                           depends=['unicodedata_db.h', 'unicodename_db.h'],
+                           extra_compile_args=['-DPy_BUILD_CORE_MODULE']))
         # _opcode module
         self.add(Extension('_opcode', ['_opcode.c']))
         # asyncio speedups