diff --git a/caching/metadata.cc b/caching/metadata.cc

index 91806f4..7b150be 100644

--- a/caching/metadata.cc

+++ b/caching/metadata.cc

@@ -128,6 +128,10 @@ void

 metadata::commit_mappings()

 {

 	sb_.mapping_root = mappings_->get_root();

+	if (sb_.version >= 2) {

+		dirty_bits_->flush();

+		sb_.dirty_root = dirty_bits_->get_root();

+	}

 }

 void