diff --git a/lib/roken/roken.h b/lib/roken/roken.h
index d3b024fb2..dae98bd8a 100644
--- a/lib/roken/roken.h
+++ b/lib/roken/roken.h
@@ -101,4 +101,8 @@ void mini_inetd (int port);
 #define STDOUT_FILENO 1
 #endif
 
+#ifndef STDERR_FILENO
+#define STDERR_FILENO 2
+#endif
+
 #endif /*  __ROKEN_H__ */
diff --git a/lib/roken/roken.h.in b/lib/roken/roken.h.in
index d3b024fb2..dae98bd8a 100644
--- a/lib/roken/roken.h.in
+++ b/lib/roken/roken.h.in
@@ -101,4 +101,8 @@ void mini_inetd (int port);
 #define STDOUT_FILENO 1
 #endif
 
+#ifndef STDERR_FILENO
+#define STDERR_FILENO 2
+#endif
+
 #endif /*  __ROKEN_H__ */