diff --git a/brightray/brightray.gyp b/brightray/brightray.gyp
index 9676795690..2732d5c9a1 100644
--- a/brightray/brightray.gyp
+++ b/brightray/brightray.gyp
@@ -70,6 +70,11 @@
               '$(SDKROOT)/System/Library/Frameworks/AppKit.framework',
             ],
           },
+        }, {
+          'sources/': [
+            ['exclude', '/mac/'],
+            ['exclude', '_mac\.(mm|h)$'],
+          ],
         }],
         ['OS=="win"', {
           'link_settings': {
@@ -79,6 +84,11 @@
               '<(libchromiumcontent_library_dir)/sandbox_static.lib',
             ],
           },
+        }, {
+          'sources/': [
+            ['exclude', '/win/'],
+            ['exclude', '_win\.(cc|h)$'],
+          ],
         }],
       ],
     },