===================================================================
RCS file: /cvs/mandoc/mdoc_validate.c,v
retrieving revision 1.389
retrieving revision 1.390
diff -u -p -r1.389 -r1.390
--- mandoc/mdoc_validate.c	2021/07/18 11:41:23	1.389
+++ mandoc/mdoc_validate.c	2021/10/04 14:19:14	1.390
@@ -1,6 +1,6 @@
-/* $Id: mdoc_validate.c,v 1.389 2021/07/18 11:41:23 schwarze Exp $ */
+/* $Id: mdoc_validate.c,v 1.390 2021/10/04 14:19:14 schwarze Exp $ */
 /*
- * Copyright (c) 2010-2020 Ingo Schwarze <schwarze@openbsd.org>
+ * Copyright (c) 2010-2021 Ingo Schwarze <schwarze@openbsd.org>
  * Copyright (c) 2008-2012 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2010 Joerg Sonnenberger <joerg@netbsd.org>
  *
@@ -2872,7 +2872,6 @@ post_os(POST_ARGS)
 {
 #ifndef OSNAME
 	struct utsname	  utsname;
-	static char	 *defbuf;
 #endif
 	struct roff_node *n;
 
@@ -2909,15 +2908,15 @@ post_os(POST_ARGS)
 #ifdef OSNAME
 	mdoc->meta.os = mandoc_strdup(OSNAME);
 #else /*!OSNAME */
-	if (defbuf == NULL) {
+	if (mdoc->os_r == NULL) {
 		if (uname(&utsname) == -1) {
 			mandoc_msg(MANDOCERR_OS_UNAME, n->line, n->pos, "Os");
-			defbuf = mandoc_strdup("UNKNOWN");
+			mdoc->os_r = mandoc_strdup("UNKNOWN");
 		} else
-			mandoc_asprintf(&defbuf, "%s %s",
+			mandoc_asprintf(&mdoc->os_r, "%s %s",
 			    utsname.sysname, utsname.release);
 	}
-	mdoc->meta.os = mandoc_strdup(defbuf);
+	mdoc->meta.os = mandoc_strdup(mdoc->os_r);
 #endif /*!OSNAME*/
 
 out: