diff --git a/_tags b/_tags
index f1907502..98970d9a 100644
--- a/_tags
+++ b/_tags
@@ -3,6 +3,6 @@
 <tests/*.ml{,i}>: thread
 <src/threads/*.ml{,i}>: thread
 <src/core/CCVector.cmx>: inline(25)
-<src/data/CCFlatHashtbl.cm*>: inline(15)
+<src/data/CCFlatHashtbl.cm*> or <src/data/CCHashTrie.cm*>: inline(15)
 <src/**/*.ml> and not <src/misc/*.ml>: warn_A, warn(-4), warn(-44)
 true: no_alias_deps, safe_string
diff --git a/src/data/CCHashTrie.ml b/src/data/CCHashTrie.ml
index daa457d5..1f3ed054 100644
--- a/src/data/CCHashTrie.ml
+++ b/src/data/CCHashTrie.ml
@@ -145,23 +145,11 @@ module Hash : sig
   val make_unsafe : int -> t
   val rem : t -> int (* 3 last bits *)
   val quotient : t -> t (* remove 3 last bits *)
-  val combine : t -> int -> t (* add 3 last bits *)
 end = struct
   type t = int
   let make_unsafe i = i
   let rem h = h land 7
   let quotient h = h lsr 3
-  let combine h r = h lsl 3 lor r
-
-  (* safety checks *)
-  let () =
-    assert (
-      List.for_all
-        (fun n ->
-          let q = quotient n and r = rem n in
-          n = combine q r
-        ) [1;2;3;4;10;205;295;4262;1515;67;8;99;224;]
-    )
 end
 
 module Make(Key : KEY)