diff --git a/libguile/stime.c b/libguile/stime.c
index 418e80f21..39621662c 100644
--- a/libguile/stime.c
+++ b/libguile/stime.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
+/* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -32,6 +32,7 @@
    hard coding __hpux.  */
 
 #define _GNU_SOURCE  /* ask glibc for everything, in particular strptime */
+#define _REENTRANT   /* ask solaris for gmtime_r prototype */
 #ifdef __hpux
 #define _POSIX_C_SOURCE 199506L  /* for gmtime_r prototype */
 #endif