diff --git a/brightray/brightray.gypi b/brightray/brightray.gypi
index ad824d6d749e..911bdc309045 100644
--- a/brightray/brightray.gypi
+++ b/brightray/brightray.gypi
@@ -178,6 +178,7 @@
         'cflags_cc': [
           '-std=gnu++11',
           '-fno-rtti',
+          '<!@(pkg-config --cflags gtk+-2.0)',
         ],
       }],
     ],