diff --git a/libs/libev/ev_vars.h b/libs/libev/ev_vars.h
index 3290a57..9bc4634 100644
--- a/libs/libev/ev_vars.h
+++ b/libs/libev/ev_vars.h
@@ -160,5 +160,9 @@ VARx(char, fs_2625) /* whether we are running in linux 2.6.25 or newer */
 VAR (fs_hash, ANFS fs_hash [EV_INOTIFY_HASHSIZE])
 #endif
 
+#if EV_MULTIPLICITY
+VARx(void*, data)
+#endif
+
 #undef VARx