diff --git a/src/transformations/native_nn_prover.ml b/src/transformations/native_nn_prover.ml
index 409c41fa4585bf52875bd73b7473deb58a413e35..a8e807bef55837698b00e70d6b0ae6653282fd62 100644
--- a/src/transformations/native_nn_prover.ml
+++ b/src/transformations/native_nn_prover.ml
@@ -66,26 +66,25 @@ let create_new_nn env input_vars outputs : string =
       | Ok { nier = Ok g; _ } -> g
     in
     let input () =
-      let o =
+      let node =
         IR.Node.create
           (Concat { inputs = List.map ~f:convert_term old_nn_args; axis = 0 })
       in
-      let o =
-        if Ir.Nier_simple.Shape.equal o.shape (IR.input_shape old_nn)
-        then o
+      let node =
+        if Ir.Nier_simple.Shape.equal node.shape (IR.input_shape old_nn)
+        then node
         else
           IR.Node.create
             (Reshape
                {
-                 input = o;
+                 input = node;
                  shape =
                    IR.Node.constant_int_array
                      (Ir.Nier_simple.Shape.to_array (IR.input_shape old_nn));
                  allowzero = 0;
                })
       in
-
-      o
+      node
     in
     let out = IR.Node.replace_input input (IR.output old_nn) in
     Ir.Nier_simple.Node.gather_int out old_index
diff --git a/tests/acasxu.t b/tests/acasxu.t
index 2d563ff1c6cd3c283bb35e95c80a7d93e9fd726d..6741acdef5fc405ba6fe2615314b391a12f7d7eb 100644
--- a/tests/acasxu.t
+++ b/tests/acasxu.t
@@ -96,7 +96,7 @@ Test verify on acasxu
   >      ensures { let o1, o2 = result in o1 .>= o2 /\ o2 .>= o1 }  =
   >       let i = normalize_input j in
   >       let o1 = (nn@@i)[clear_of_conflict] in
-  >       let o2 = (nn@@i)[clear_of_conflict] in
+  >       let o2 = (nn@@i)[weak_left] in
   >       o1, o2
   > 
   >   (* goal P1: