3 files changed, 4 insertions, 4 deletions
diff --git a/theories/MSets/MSetAVL.v b/theories/MSets/MSetAVL.v
index 8f825c5841..56186e623c 100644
--- a/theories/MSets/MSetAVL.v
+++ b/theories/MSets/MSetAVL.v
@@ -538,7 +538,7 @@ Definition IsOk := bst.
 
 Class Ok (s:t) : Prop := { ok : bst s }.
 
-Instance bst_Ok s (Hs : bst s) : Ok s := Hs.
+Instance bst_Ok s (Hs : bst s) : Ok s := { ok := Hs }.
 
 Fixpoint ltb_tree x s :=
  match s with
@@ -1523,7 +1523,7 @@ Proof.
  destruct (andb_prop _ _ H0); auto.
  (* <- *)
  induction s; simpl; auto.
- intros.
+ intros. red in H0.
  rewrite IHs1; try red; auto.
  rewrite IHs2; try red; auto.
  generalize (H0 t0).
diff --git a/theories/MSets/MSetList.v b/theories/MSets/MSetList.v
index b7b9a024a9..c5e300cdd4 100644
--- a/theories/MSets/MSetList.v
+++ b/theories/MSets/MSetList.v
@@ -225,7 +225,7 @@ Module MakeRaw (X: OrderedType) <: RawSets X.
   Hint Resolve @ok.
   Hint Constructors Ok.
 
-  Instance Sort_Ok s `(Hs : Sort s) : Ok s := Hs.
+  Instance Sort_Ok s `(Hs : Sort s) : Ok s := { ok := Hs }.
 
   Ltac inv_ok := match goal with
    | H:Ok (_ :: _) |- _ => apply @ok in H; inversion_clear H; inv_ok
diff --git a/theories/MSets/MSetWeakList.v b/theories/MSets/MSetWeakList.v
index 0af8a24aa4..c49ab9d95b 100644
--- a/theories/MSets/MSetWeakList.v
+++ b/theories/MSets/MSetWeakList.v
@@ -126,7 +126,7 @@ Module MakeRaw (X:DecidableType) <: WRawSets X.
   Hint Constructors Ok.
   Hint Resolve @ok.
 
-  Instance NoDup_Ok s (nd : NoDup s) : Ok s := nd.
+  Instance NoDup_Ok s (nd : NoDup s) : Ok s := { ok := nd }.
 
   Ltac inv_ok := match goal with
    | H:Ok (_ :: _) |- _ => apply @ok in H; inversion_clear H; inv_ok