diff --git a/infer/src/bufferoverrun/bufferOverrunChecker.ml b/infer/src/bufferoverrun/bufferOverrunChecker.ml
index 69df868f6..661764e8b 100644
--- a/infer/src/bufferoverrun/bufferOverrunChecker.ml
+++ b/infer/src/bufferoverrun/bufferOverrunChecker.ml
@@ -586,7 +586,7 @@ module Report = struct
       let error_desc = Localise.desc_buffer_overrun description in
       let exn = Exceptions.Checkers (issue_type, error_desc) in
       let trace =
-        match TraceSet.choose_shortest trace.PO.ConditionTrace.val_traces with
+        match TraceSet.choose_shortest (PO.ConditionTrace.get_val_traces trace) with
         | trace ->
             make_err_trace trace description
         | exception _ ->
diff --git a/infer/src/bufferoverrun/bufferOverrunProofObligations.ml b/infer/src/bufferoverrun/bufferOverrunProofObligations.ml
index a671ba107..74e0a03b0 100644
--- a/infer/src/bufferoverrun/bufferOverrunProofObligations.ml
+++ b/infer/src/bufferoverrun/bufferOverrunProofObligations.ml
@@ -390,6 +390,8 @@ module ConditionTrace = struct
         ()
 
 
+  let get_val_traces {val_traces} = val_traces
+
   let get_report_location : t -> Location.t =
    fun ct -> match ct.cond_trace with Intra -> ct.issue_location | Inter {call_site} -> call_site
 
diff --git a/infer/src/bufferoverrun/bufferOverrunProofObligations.mli b/infer/src/bufferoverrun/bufferOverrunProofObligations.mli
new file mode 100644
index 000000000..7fa356517
--- /dev/null
+++ b/infer/src/bufferoverrun/bufferOverrunProofObligations.mli
@@ -0,0 +1,54 @@
+(*
+ * Copyright (c) 2018-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *)
+
+open! IStd
+open! AbstractDomain.Types
+module ItvPure = Itv.ItvPure
+module Relation = BufferOverrunDomainRelation
+module ValTraceSet = BufferOverrunTrace.Set
+
+module Condition : sig
+  type t
+end
+
+module ConditionTrace : sig
+  type t
+
+  val get_report_location : t -> Location.t
+
+  val get_val_traces : t -> ValTraceSet.t
+end
+
+module ConditionSet : sig
+  type t
+
+  val empty : t
+
+  val pp : Format.formatter -> t -> unit
+
+  val pp_summary : Format.formatter -> t -> unit
+
+  val add_array_access :
+    Location.t -> idx:ItvPure.astate -> size:ItvPure.astate -> is_collection_add:bool
+    -> idx_sym_exp:Relation.SymExp.t option -> size_sym_exp:Relation.SymExp.t option
+    -> relation:Relation.astate -> ValTraceSet.t -> t -> t
+
+  val add_alloc_size : Location.t -> length:ItvPure.astate -> ValTraceSet.t -> t -> t
+
+  val join : t -> t -> t
+
+  val subst :
+    t -> Bounds.Bound.t bottom_lifted Symb.SymbolMap.t * ValTraceSet.t Symb.SymbolMap.t
+    -> Relation.SubstMap.t -> Relation.astate -> Typ.Procname.t -> Location.t -> t
+
+  val check_all : report:(Condition.t -> ConditionTrace.t -> IssueType.t -> unit) -> t -> t
+  (** Check the conditions, call [report] on those that trigger an issue, returns those that needs to be propagated to callers. *)
+
+  val forget_locs : AbsLoc.PowLoc.t -> t -> t
+end
+
+val description : Condition.t -> ConditionTrace.t -> string