diff --git a/lib/roken/parse_units.h b/lib/roken/parse_units.h
index a56533b2e..3601839f3 100644
--- a/lib/roken/parse_units.h
+++ b/lib/roken/parse_units.h
@@ -54,7 +54,14 @@ int
 parse_units (const char *s, const struct units *units,
 	     const char *def_unit);
 
+int
+parse_flags (const char *s, const struct units *units,
+	     int orig);
+
 size_t
 unparse_units (int num, const struct units *units, char *s, size_t len);
 
+size_t
+unparse_flags (int num, const struct units *units, char *s, size_t len);
+
 #endif /* __PARSE_UNITS_H__ */