diff --git a/gyp/tools.gyp b/gyp/tools.gyp
index b4ce755..42638fd 100644
--- a/gyp/tools.gyp
+++ b/gyp/tools.gyp
@@ -404,6 +404,7 @@
         '../tools/picture_utils.h',
       ],
       'include_dirs': [
+          '../include/private',
           '../src/core/',
       ],
       'dependencies': [