diff --git a/plugins/fastrouter/fastrouter.c b/plugins/fastrouter/fastrouter.c
index 42e4d5a2..7635b7e8 100644
--- a/plugins/fastrouter/fastrouter.c
+++ b/plugins/fastrouter/fastrouter.c
@@ -595,7 +595,7 @@ void fastrouter_loop(int id) {
 
 						if (ufr.post_buffering > 0 && fr_session->post_cl > ufr.post_buffering) {
 							fr_session->status = FASTROUTER_STATUS_BUFFERING;
-							fr_session->buf_file_name = tempnam(ufr.pb_base_dir, "uwsgi");
+							fr_session->buf_file_name = uwsgi_tmpname(ufr.pb_base_dir, "uwsgiXXXXX");
 							if (!fr_session->buf_file_name) {
 								uwsgi_error("tempnam()");
 								close_session(fr_session);
diff --git a/utils.c b/utils.c
index 45a5e506..b2598542 100644
--- a/utils.c
+++ b/utils.c
@@ -3760,3 +3760,13 @@ void uwsgi_add_app(int id, uint8_t modifier1, char *mountpoint, int mountpoint_l
         }
 }
 
+
+char *uwsgi_tmpname(char *base, char *id) {
+	char *template = uwsgi_concat3(base, "/", id);
+	if (mkstemp(template) < 0) {
+		free(template);
+		return NULL;
+	}
+
+	return template;
+}
diff --git a/uwsgi.h b/uwsgi.h
index bf8ae6cc..8197bc71 100644
--- a/uwsgi.h
+++ b/uwsgi.h
@@ -2554,6 +2554,8 @@ void uwsgi_opt_set_cap(char *, char *, void *);
 void uwsgi_opt_set_unshare(char *, char *, void *);
 #endif
 
+char *uwsgi_tmpname(char *, char *);
+
 
 #ifdef UWSGI_AS_SHARED_LIBRARY
 int uwsgi_init(int, char **, char **);