diff --git a/src/setup.py b/src/setup.py
index 5ed46a24c..82d440209 100755
--- a/src/setup.py
+++ b/src/setup.py
@@ -301,6 +301,8 @@ def def_split(x):
 if os.name == 'nt':
   # Windows systems: we just know what the OpenGL library is.
   gl_info = {'libraries': ['opengl32']}
+  # And glib needs a slight hack to work correctly.
+  glib_info['define_macros'].append(('inline', '__inline'))
 else:
   # Other systems: we ask pkg-config.
   gl_info = pc_info('gl')