diff --git a/reader_permit.hh b/reader_permit.hh
index 8d85d19aa4..9c977acc17 100644
--- a/reader_permit.hh
+++ b/reader_permit.hh
@@ -31,6 +31,8 @@ struct reader_resources {
     int count = 0;
     ssize_t memory = 0;
 
+    static reader_resources with_memory(ssize_t memory) { return reader_resources(0, memory); }
+
     reader_resources() = default;
 
     reader_resources(int count, ssize_t memory)