diff --git a/src/irmin-pack/io/atomic_write.ml b/src/irmin-pack/io/atomic_write.ml
index a430955fe8..b309d1570e 100644
--- a/src/irmin-pack/io/atomic_write.ml
+++ b/src/irmin-pack/io/atomic_write.ml
@@ -2,14 +2,14 @@ open Import
 include Irmin_pack.Atomic_write
 
 module Table (K : Irmin.Type.S) = struct
-  module K = (struct
+  module K = struct
     include K
 
     type t = K.t [@@deriving irmin ~short_hash ~equal]
 
     let hash = short_hash ?seed:None
     let equal = Irmin.Type.(unstage (equal K.t))
-  end)
+  end
 
   include Kcas_data.Hashtbl
 
diff --git a/src/irmin-pack/io/pack_store.ml b/src/irmin-pack/io/pack_store.ml
index acfa41d3fc..bb80bbc2c0 100644
--- a/src/irmin-pack/io/pack_store.ml
+++ b/src/irmin-pack/io/pack_store.ml
@@ -25,12 +25,12 @@ let invalid_read fmt = Fmt.kstr (fun s -> raise (Invalid_read s)) fmt
 let corrupted_store fmt = Fmt.kstr (fun s -> raise (Corrupted_store s)) fmt
 
 module Table (K : Irmin.Hash.S) = struct
-  module K = (struct
+  module K = struct
     include K
 
     let hash = short_hash
     let equal = Irmin.Type.(unstage (equal K.t))
-  end)
+  end
 
   include Kcas_data.Hashtbl
 
diff --git a/src/irmin/lru.ml b/src/irmin/lru.ml
index bd63a1477f..4938c6f2f0 100644
--- a/src/irmin/lru.ml
+++ b/src/irmin/lru.ml
@@ -137,8 +137,7 @@ module Make (H : Hashtbl.HashedType) = struct
       | Some v ->
           promote ~xt t v;
           snd v.value
-      | None ->
-          raise Not_found
+      | None -> raise Not_found
     in
     Xt.commit { tx }
 
@@ -160,6 +159,5 @@ module Make (H : Hashtbl.HashedType) = struct
     in
     Xt.commit { tx }
 
-  let iter t f =
-    HT.iter (fun k q -> f k (snd q.Q.value)) t.ht
+  let iter t f = HT.iter (fun k q -> f k (snd q.Q.value)) t.ht
 end