diff --git a/src/add-ons/kernel/file_systems/bfs/BlockAllocator.cpp b/src/add-ons/kernel/file_systems/bfs/BlockAllocator.cpp
index ff33211b94..16b269b993 100644
--- a/src/add-ons/kernel/file_systems/bfs/BlockAllocator.cpp
+++ b/src/add-ons/kernel/file_systems/bfs/BlockAllocator.cpp
@@ -392,6 +392,7 @@ BlockAllocator::InitializeAndClearBitmap(Transaction &transaction)
 		FATAL(("could not allocate reserved space for block bitmap/log!\n"));
 		return B_ERROR;
 	}
+	fVolume->SuperBlock().used_blocks = HOST_ENDIAN_TO_BFS_INT64(reservedBlocks);
 
 	return B_OK;
 }