diff --git a/winsup/cygwin/local_includes/wincap.h b/winsup/cygwin/local_includes/wincap.h
index 29a7a63de..c14872787 100644
--- a/winsup/cygwin/local_includes/wincap.h
+++ b/winsup/cygwin/local_includes/wincap.h
@@ -32,6 +32,7 @@ struct wincaps
     unsigned has_linux_tcp_keepalive_sockopts			: 1;
     unsigned has_tcp_maxrtms					: 1;
     unsigned has_con_broken_tabs				: 1;
+    unsigned has_user_shstk					: 1;
   };
 };
 
@@ -84,6 +85,7 @@ public:
   bool	IMPLEMENT (has_linux_tcp_keepalive_sockopts)
   bool	IMPLEMENT (has_tcp_maxrtms)
   bool	IMPLEMENT (has_con_broken_tabs)
+  bool	IMPLEMENT (has_user_shstk)
 
   void disable_case_sensitive_dirs ()
   {