diff --git a/lib/thread.h b/lib/thread.h
index a088b47..9743a22 100644
--- a/lib/thread.h
+++ b/lib/thread.h
@@ -234,4 +234,8 @@
 extern struct timeval recent_time;
 /* Similar to recent_time, but a monotonically increasing time value */
 extern struct timeval recent_relative_time (void);
+
+/* only for use in logging functions! */
+extern struct thread *thread_current;
+
 #endif /* _ZEBRA_THREAD_H */