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-rw-r--r--numpy/distutils/command/build_ext.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/numpy/distutils/command/build_ext.py b/numpy/distutils/command/build_ext.py
index 2945d1ff5..8d26718d0 100644
--- a/numpy/distutils/command/build_ext.py
+++ b/numpy/distutils/command/build_ext.py
@@ -284,7 +284,7 @@ class build_ext (old_build_ext):
# Py_ModuleInit4_64, etc... So we add it here
if self.compiler.compiler_type == 'mingw32' and \
get_build_architecture() == 'AMD64':
- macros.append(('MS_WIN64',))
+ macros.append(('MS_WIN64', None))
# Set Fortran/C++ compilers for compilation and linking.
if ext.language=='f90':