diff --git a/setup.py b/setup.py
index 0c4c78054..04cf8925b 100644
--- a/setup.py
+++ b/setup.py
@@ -147,7 +147,8 @@ class CMakeBuild(build_ext):
             cmake_args += ['-DCMAKE_LIBRARY_OUTPUT_DIRECTORY_{}={}'.format(cfg.upper(), extdir)]
             if sys.maxsize > 2**32:
                 cmake_args += ['-A', 'x64']
-            build_args += ['--', '/m']
+            # Do a parallel build
+            build_args += ['--', '/m'] 
         else:
             cmake_args += ['-DCMAKE_BUILD_TYPE=' + cfg]
             # Do a parallel build