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-rw-r--r--src/rewriter.ml2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/rewriter.ml b/src/rewriter.ml
index 62e4f7ef..1857087f 100644
--- a/src/rewriter.ml
+++ b/src/rewriter.ml
@@ -1982,7 +1982,7 @@ let remove_bitvector_pat pat =
let collect_guards_decls ps rootid t =
let (start,_,ord,_) = vector_typ_args_of t in
let rec collect current (guards,dls) idx ps =
- let idx' = if is_order_inc ord then add_big_int idx unit_big_int else add_big_int idx unit_big_int in
+ let idx' = if is_order_inc ord then add_big_int idx unit_big_int else sub_big_int idx unit_big_int in
(match ps with
| pat :: ps' ->
(match pat with