diff --git a/acinclude.m4 b/acinclude.m4
index 6a0db8a5a0..99947094cc 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -1210,7 +1210,7 @@ AC_SUBST(BUILD_LOGIN)
 
 AC_CHECK_FUNCS(utimes random srandom getdtablesize snprintf strlcat strlcpy re_comp re_exec flock)
 AC_CHECK_FUNCS(setprogname getprogname sigaction mkstemp vsnprintf strerror strcasestr)
-AC_CHECK_FUNCS(setvbuf)
+AC_CHECK_FUNCS(setvbuf vsyslog)
 AC_FUNC_SETVBUF_REVERSED
 AC_CHECK_FUNCS(regcomp regexec regerror)
 AC_MSG_CHECKING([for POSIX regex library])
diff --git a/src/util/snprintf.c b/src/util/snprintf.c
index ca511a1b8f..7f2452c7f4 100644
--- a/src/util/snprintf.c
+++ b/src/util/snprintf.c
@@ -521,6 +521,16 @@ vsnprintf(char *p, unsigned int avail, char *fmt, va_list ap)
 }
 #endif /* AFS_OSF20_ENV || AFS_AIX32_ENV */
 
+#ifndef HAVE_VSYSLOG
+void
+vsyslog(int priority, const char *format, va_list args)
+{
+  char buf[1024];
+  vsnprintf(buf, sizeof(buf), format, args);
+  syslog(priority, "%s", buf);
+}
+#endif
+
 #ifndef AFS_NT40_ENV
 #if defined(AFS_OSF20_ENV) && !defined(AFS_DUX50_ENV) || defined(AFS_AIX32_ENV) || (defined(AFS_SUN55_ENV) && !defined(AFS_SUN56_ENV)) || !defined(HAVE_SNPRINTF)