diff --git a/lib/libtb/log.c b/lib/libtb/log.c
index 9a47dcec266c95d460e1c66ba854925b0571cca6..3ecd54079b5cdcb224ead1e9a28718eaed21b7f3 100644
--- a/lib/libtb/log.c
+++ b/lib/libtb/log.c
@@ -52,6 +52,15 @@ loginit(int slog, char *name)
 	return 0;
 }
 
+/*
+ * Switch to syslog; caller has already opened syslog connection.
+ */
+void
+logsyslog(void)
+{
+	usesyslog = 1;
+}
+
 void
 info(const char *fmt, ...)
 {
diff --git a/lib/libtb/log.h b/lib/libtb/log.h
index 1fa2efb3e81e4e0b30b6254c952b7d96b059d94f..41867f33a951146b8fa02ae153b0a015b75fb273 100644
--- a/lib/libtb/log.h
+++ b/lib/libtb/log.h
@@ -1,6 +1,6 @@
 /*
  * EMULAB-COPYRIGHT
- * Copyright (c) 2000-2002 University of Utah and the Flux Group.
+ * Copyright (c) 2000-2003 University of Utah and the Flux Group.
  * All rights reserved.
  */
 
@@ -10,6 +10,7 @@
 #include <stdarg.h>
 
 int	loginit(int usesyslog, char *name);
+void	logsyslog(void);
 void	info(const char *fmt, ...);
 void	warning(const char *fmt, ...);
 void	error(const char *fmt, ...);