diff --git a/gyp/sfnt.gyp b/gyp/sfnt.gyp
index c129570..7ff635b 100644
--- a/gyp/sfnt.gyp
+++ b/gyp/sfnt.gyp
@@ -13,6 +13,7 @@
         'core.gyp:*',
       ],
       'include_dirs': [
+        '../include/private',
         '../src/core',
         '../src/sfnt',
       ],