diff --git a/checks/UsageCheckAlgorithms.hs b/checks/UsageCheckAlgorithms.hs
index 4633977..666c980 100644
--- a/checks/UsageCheckAlgorithms.hs
+++ b/checks/UsageCheckAlgorithms.hs
@@ -41,13 +41,13 @@ joinCheckParFunctions f g x = seqPair (f x, g x)
 checkPar :: forall m a b. Monad m => (a -> Maybe (A.Name, A.Replicator)) -> ((Meta, ParItems a) -> m b) -> FlowGraph m a -> m [b]
 checkPar getRep f g = mapM f =<< allParItems
   where
-    allStartParEdges :: m (Map.Map Int (Maybe (A.Name, A.Replicator), [(Node,Node)]))
+    allStartParEdges :: m (Map.Map Integer (Maybe (A.Name, A.Replicator), [(Node,Node)]))
     allStartParEdges = foldM helper Map.empty parEdges
       where
         parEdges = mapMaybe tagStartParEdge $ labEdges g
 
-        helper :: Map.Map Int (Maybe (A.Name, A.Replicator), [(Node,Node)]) -> (Node,Node,Int) ->
-          m (Map.Map Int (Maybe (A.Name, A.Replicator), [(Node,Node)]))
+        helper :: Map.Map Integer (Maybe (A.Name, A.Replicator), [(Node,Node)]) -> (Node,Node,Integer) ->
+          m (Map.Map Integer (Maybe (A.Name, A.Replicator), [(Node,Node)]))
         helper mp (s,e,n)
           | r == Nothing = fail "Could not find label for node"
           | prevR == Nothing || prevR == r =  return $ Map.insertWith add n (join r,[(s,e)]) mp
@@ -61,7 +61,7 @@ checkPar getRep f g = mapM f =<< allParItems
             r :: Maybe (Maybe (A.Name, A.Replicator))
             r = lab g s >>* (getRep . getNodeData)
   
-    tagStartParEdge :: (Node,Node,EdgeLabel) -> Maybe (Node,Node,Int)
+    tagStartParEdge :: (Node,Node,EdgeLabel) -> Maybe (Node,Node,Integer)
     tagStartParEdge (s,e,EStartPar n) = Just (s,e,n)
     tagStartParEdge _ = Nothing
     
@@ -78,13 +78,13 @@ checkPar getRep f g = mapM f =<< allParItems
           where
             distinctItems = nub $ map fst ns
 
-        findMetaAndNodes :: (Int,(Maybe (A.Name, A.Replicator), [(Node,Node)])) -> m (Meta, ParItems a)
+        findMetaAndNodes :: (Integer,(Maybe (A.Name, A.Replicator), [(Node,Node)])) -> m (Meta, ParItems a)
         findMetaAndNodes x@(_,(_,ns)) = seqPair (checkAndGetMeta ns, return $ findNodes x)
 
-        findNodes :: (Int,(Maybe (A.Name, A.Replicator), [(Node,Node)])) -> ParItems a
+        findNodes :: (Integer,(Maybe (A.Name, A.Replicator), [(Node,Node)])) -> ParItems a
         findNodes (n, (mr, ses)) = maybe id RepParItem mr $ ParItems $ map (makeSeqItems n . snd) ses
         
-        makeSeqItems :: Int -> Node -> ParItems a
+        makeSeqItems :: Integer -> Node -> ParItems a
         makeSeqItems n e = SeqItems (followUntilEdge e (EEndPar n))
     
     -- | We need to follow all edges out of a particular node until we reach
diff --git a/flow/FlowGraph.hs b/flow/FlowGraph.hs
index bb7d9d5..3e561a0 100644
--- a/flow/FlowGraph.hs
+++ b/flow/FlowGraph.hs
@@ -194,7 +194,7 @@ buildStructuredSeq (A.ProcThen _ p str) route
        pe --> ss
        return (ps, se)
 
-buildStructuredPar :: (Monad mLabel, Monad mAlter) => Int -> (Node, Node) ->
+buildStructuredPar :: (Monad mLabel, Monad mAlter) => Integer -> (Node, Node) ->
   A.Structured A.Process -> ASTModifier mAlter (A.Structured A.Process) structType ->
   GraphMaker mLabel mAlter label structType (Either Bool (Node, Node))
 buildStructuredPar pId (nStart, nEnd) (A.Several m ss) route
diff --git a/flow/FlowUtils.hs b/flow/FlowUtils.hs
index 5e5f4f8..21f2f28 100644
--- a/flow/FlowUtils.hs
+++ b/flow/FlowUtils.hs
@@ -39,7 +39,7 @@ import Utils
 -- Multiple Seq links means choice.
 -- Multiple Par links means a parallel branch.  All outgoing par links should have the same identifier,
 -- and this identifier is unique and matches a later endpar link
-data EdgeLabel = ESeq (Maybe Bool) | EStartPar Int | EEndPar Int deriving (Show, Eq, Ord)
+data EdgeLabel = ESeq (Maybe Bool) | EStartPar Integer | EEndPar Integer deriving (Show, Eq, Ord)
 
 -- | A type used to build up tree-modifying functions.  When given an inner modification function,
 -- it returns a modification function for the whole tree.  The functions are monadic, to
@@ -92,7 +92,7 @@ type NodesEdges m a b = ([LNode (FNode' b m a)],[LEdge EdgeLabel])
 -- * The list of terminator nodes thus far (those with no links from them)
 data GraphMakerState mAlter a b = GraphMakerState
   { nextNodeId :: Node
-  , nextParId :: Int
+  , nextParId :: Integer
   , graphNodesEdges :: NodesEdges mAlter a b
   , rootNodes :: [Node]
   , termNodes :: [Node]
@@ -248,18 +248,18 @@ addDummyNode :: (Monad mLabel, Monad mAlter) => Meta -> ASTModifier mAlter a str
   -> GraphMaker mLabel mAlter label structType Node
 addDummyNode m mod = addNode' m labelDummy m (AlterNothing $ routeId mod)
 
-getNextParEdgeId :: (Monad mLabel, Monad mAlter) => GraphMaker mLabel mAlter label structType Int
+getNextParEdgeId :: (Monad mLabel, Monad mAlter) => GraphMaker mLabel mAlter label structType Integer
 getNextParEdgeId = do st <- get
                       put $ st {nextParId = nextParId st + 1}
                       return $ nextParId st
 
-addParEdges :: (Monad mLabel, Monad mAlter) => Int -> (Node,Node) -> [(Node,Node)] -> GraphMaker mLabel mAlter label structType ()
+addParEdges :: (Monad mLabel, Monad mAlter) => Integer -> (Node,Node) -> [(Node,Node)] -> GraphMaker mLabel mAlter label structType ()
 addParEdges usePI (s,e) pairs
   = do st <- get
        let (nodes,edges) = graphNodesEdges st
        put $ st {graphNodesEdges = (nodes,edges ++ (concatMap (parEdge usePI) pairs))}
   where
-    parEdge :: Int -> (Node, Node) -> [LEdge EdgeLabel]
+    parEdge :: Integer -> (Node, Node) -> [LEdge EdgeLabel]
     parEdge id (a,z) = [(s,a,(EStartPar id)),(z,e,(EEndPar id))]
 
 mapMR :: forall inner mAlter mLabel label retType structType. (Monad mLabel, Monad mAlter) =>