diff --git a/src/lib/libc/stdlib/abort.c b/src/lib/libc/stdlib/abort.c
index e8495753..8f326d15 100644
--- a/src/lib/libc/stdlib/abort.c
+++ b/src/lib/libc/stdlib/abort.c
@@ -32,7 +32,7 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static char *rcsid = "$OpenBSD: abort.c,v 1.2 1996/08/19 08:33:20 tholo Exp $";
+static char *rcsid = "$OpenBSD: abort.c,v 1.3 1996/10/25 03:09:15 tholo Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <signal.h>
@@ -44,6 +44,12 @@ abort()
 {
 	sigset_t mask;
 
+	/*
+	 * POSIX requires we flush stdio buffers on abort
+	 */
+	if (__cleanup)
+		(*__cleanup)();
+
 	sigfillset(&mask);
 	/*
 	 * don't block SIGABRT to give any handler a chance; we ignore