diff --git a/domains/domain.ml b/domains/domain.ml
index 03d4e16..483e242 100644
--- a/domains/domain.ml
+++ b/domains/domain.ml
@@ -30,7 +30,7 @@ module type DOMAIN =
     type t
 
     (* initial environment, with all variables initialized to 0 *)
-    val init: t
+    val init: int -> t
 
     (* empty set of environments *)
     val bottom: t
diff --git a/domains/value_domain.ml b/domains/value_domain.ml
index 9958fc8..d6aaebe 100644
--- a/domains/value_domain.ml
+++ b/domains/value_domain.ml
@@ -98,7 +98,7 @@ open Domain
 module NonRelational (V : VALUE_DOMAIN) : DOMAIN = struct
 	module VMap = VarMap
 	type t = Bot | E of V.t VMap.t
-	let init = E VMap.empty (* Nonpresent variables are 0 *)
+	let init _ = E VMap.empty (* Nonpresent variables are 0 *)
 	let bottom = Bot
 
 
diff --git a/iterator/iterable.ml b/iterator/iterable.ml
index 9a4a389..6352ec3 100644
--- a/iterator/iterable.ml
+++ b/iterator/iterable.ml
@@ -5,7 +5,7 @@ open Domain
 module type ITERABLE = sig
 	type t (*type of a node abst*)
 	val bottom : t
-	val init : t
+	val init : int -> t
 
 	val do_compute : arc -> t (*source*) -> (arc -> unit) -> (func -> t -> t) -> t (*to accumulate*)
 	val accumulate : arc -> t (*source*) -> t (*old dst*) -> t*bool (*dst*)
@@ -15,7 +15,7 @@ module SimpleIterable (D : DOMAIN) : ITERABLE = struct
 	type t = D.t
 
 	let bottom = D.bottom
-	let init = D.init
+	let init x = D.init x
 
 	let do_compute a src cb_fail cb_fun = match a.arc_inst with
 		| CFG_skip _ -> src
@@ -63,7 +63,7 @@ module DisjunctiveIterable (D : DOMAIN) : ITERABLE = struct
 	type t = D.t SCRMap.t
 	
 	let bottom = SCRMap.empty
-	let init   = SCRMap.singleton [] D.init
+	let init x = SCRMap.singleton [] (D.init x)
 
 	let do_compute a src cb_fail cb_fun = match a.arc_inst with
 		| CFG_skip _ -> src
diff --git a/iterator/iterator.ml b/iterator/iterator.ml
index e66f417..ba3e431 100644
--- a/iterator/iterator.ml
+++ b/iterator/iterator.ml
@@ -57,7 +57,7 @@ module Iterator (I : ITERABLE) = struct
 					func_exit = cfg.cfg_init_exit;
 					func_args = [];
 					func_ret = None;
-					func_calls = []} I.init in
+					func_calls = []} (I.init (List.length cfg.cfg_vars))in
 			let rec do_main l = match l with
 				| x::_ when x.func_name = "main" -> do_fun x init_st
 				| _::q -> do_main q