diff --git a/libs/main/io_devices/pidir.cpp b/libs/main/io_devices/pidir.cpp
index 9eda8608..611a3ce2 100644
--- a/libs/main/io_devices/pidir.cpp
+++ b/libs/main/io_devices/pidir.cpp
@@ -507,7 +507,8 @@ PIDir PIDir::temporary() {
 	s.prepend(separator);
 	return PIDir(s);
 #else
-	rc = mkdtemp("/tmp/pidir_tmp_XXXXXX");
+	char template_rc[] = "/tmp/pidir_tmp_XXXXXX";
+	rc                 = mkdtemp(template_rc);
 	if (!rc) return PIDir();
 	PIString s(rc);
 	return PIDir(s.left(s.findLast(PIDir::separator)));