diff --git a/src/mapi/glapi/SConscript b/src/mapi/glapi/SConscript
index bc1c43aa865..97ebfe638ae 100644
--- a/src/mapi/glapi/SConscript
+++ b/src/mapi/glapi/SConscript
@@ -16,6 +16,7 @@ if env['platform'] == 'windows':
     env.Append(CPPDEFINES = [
         '_GDI32_', # prevent gl* being declared __declspec(dllimport) in MS headers
         'BUILD_GL32', # declare gl* as __declspec(dllexport) in Mesa headers
+        'KHRONOS_DLL_EXPORTS', # declare gl* as __declspec(dllexport) in Khronos headers
     ])
     if env['gles']:
         env.Append(CPPDEFINES = ['_GLAPI_DLL_EXPORTS'])