diff --git a/winsup/cygwin/hires.h b/winsup/cygwin/hires.h
index 5c75cf65a..04ee6066a 100644
--- a/winsup/cygwin/hires.h
+++ b/winsup/cygwin/hires.h
@@ -67,4 +67,5 @@ class hires_ms : public hires_base
 };
 
 extern hires_ms gtod;
+extern hires_ns ntod;
 #endif /*__HIRES_H__*/