diff --git a/lib/cobalt/rtdm.c b/lib/cobalt/rtdm.c
index 6b8898e7095855f8ad8b31fb7e0c51519291f4cf..176210ddc575dc01c2320496cf05ba35d217dcfd 100644
--- a/lib/cobalt/rtdm.c
+++ b/lib/cobalt/rtdm.c
@@ -30,6 +30,12 @@
 #include <asm/xenomai/syscall.h>
 #include "internal.h"
 
+/* support for very old c libraries not supporting O_TMPFILE */
+#ifndef O_TMPFILE
+#define O_TMPFILE (020000000 | 0200000)
+#endif
+
+
 static inline int set_errno(int ret)
 {
 	if (ret >= 0)
@@ -65,7 +71,7 @@ COBALT_IMPL(int, open, (const char *path, int oflag, ...))
 	mode_t mode = 0;
 	va_list ap;
 
-	if (oflag & O_CREAT) {
+	if ((oflag & O_CREAT)  || (oflag & O_TMPFILE) == O_TMPFILE) {
 		va_start(ap, oflag);
 		mode = va_arg(ap, int);
 		va_end(ap);
@@ -79,7 +85,7 @@ COBALT_IMPL(int, open64, (const char *path, int oflag, ...))
 	mode_t mode = 0;
 	va_list ap;
 
-	if (oflag & O_CREAT) {
+	if ((oflag & O_CREAT)  || (oflag & O_TMPFILE) == O_TMPFILE) {
 		va_start(ap, oflag);
 		mode = va_arg(ap, int);
 		va_end(ap);
diff --git a/lib/cobalt/wrappers.c b/lib/cobalt/wrappers.c
index 20ad63a616e362d900f3824d46e0a54495727118..323f60b92e47cd5ef23049af7dac5e3bf583d3e0 100644
--- a/lib/cobalt/wrappers.c
+++ b/lib/cobalt/wrappers.c
@@ -44,6 +44,11 @@
 #include <malloc.h>
 #include <boilerplate/compiler.h>
 
+/* support for very old c libraries not supporting O_TMPFILE */
+#ifndef O_TMPFILE
+#define O_TMPFILE (020000000 | 0200000)
+#endif
+
 /* sched */
 __weak
 int __real_pthread_setschedparam(pthread_t thread,
@@ -174,7 +179,7 @@ int __real_open(const char *path, int oflag, ...)
 	mode_t mode = 0;
 	va_list ap;
 
-	if (oflag & O_CREAT) {
+	if ((oflag & O_CREAT) || (oflag & O_TMPFILE) == O_TMPFILE) {
 		va_start(ap, oflag);
 		mode = va_arg(ap, mode_t);
 		va_end(ap);
@@ -190,7 +195,7 @@ int __real_open64(const char *path, int oflag, ...)
 	mode_t mode = 0;
 	va_list ap;
 
-	if (oflag & O_CREAT) {
+	if ((oflag & O_CREAT) || (oflag & O_TMPFILE) == O_TMPFILE) {
 		va_start(ap, oflag);
 		mode = va_arg(ap, mode_t);
 		va_end(ap);