diff --git a/src/Database/LSMTree/Internal/Snapshot.hs b/src/Database/LSMTree/Internal/Snapshot.hs
index ea3ca8967..cf0713f96 100644
--- a/src/Database/LSMTree/Internal/Snapshot.hs
+++ b/src/Database/LSMTree/Internal/Snapshot.hs
@@ -109,7 +109,7 @@ data SnapshotMetaData = SnapshotMetaData {
     -- opened: see 'TableConfigOverride'.
   , snapMetaConfig    :: !TableConfig
     -- | The write buffer.
-  , snapWriteBuffer   :: !(RunNumber)
+  , snapWriteBuffer   :: !RunNumber
     -- | The shape of the levels of the LSM tree.
   , snapMetaLevels    :: !(SnapLevels RunNumber)
   }