diff --git a/src/system_wrappers/source/system_wrappers.gyp b/src/system_wrappers/source/system_wrappers.gyp
index a16cd73c4c..96ee1ad3e7 100644
--- a/src/system_wrappers/source/system_wrappers.gyp
+++ b/src/system_wrappers/source/system_wrappers.gyp
@@ -34,6 +34,7 @@
         '../interface/file_wrapper.h',
         '../interface/list_wrapper.h',
         '../interface/map_wrapper.h',
+        '../interface/ref_count.h',
         '../interface/rw_lock_wrapper.h',
         '../interface/scoped_ptr.h',
         '../interface/sort.h',