diff --git a/theories/option.v b/theories/option.v
index ff4bfd4401eba420227ec5273bcff2ba05de3409..412cd5ce1c09b69bc6041e9cdbfd138cda585499 100644
--- a/theories/option.v
+++ b/theories/option.v
@@ -121,12 +121,13 @@ Section setoids.
   Global Instance option_equivalence :
     Equivalence (≡@{A}) → Equivalence (≡@{option A}).
   Proof. apply _. Qed.
+  Global Instance option_leibniz `{!LeibnizEquiv A} : LeibnizEquiv (option A).
+  Proof. intros x y; destruct 1; f_equal; by apply leibniz_equiv. Qed.
+
   Global Instance Some_proper : Proper ((≡) ==> (≡@{option A})) Some.
   Proof. by constructor. Qed.
   Global Instance Some_equiv_inj : Inj (≡) (≡@{option A}) Some.
   Proof. by inversion_clear 1. Qed.
-  Global Instance option_leibniz `{!LeibnizEquiv A} : LeibnizEquiv (option A).
-  Proof. intros x y; destruct 1; f_equal; by apply leibniz_equiv. Qed.
 
   Lemma equiv_None mx : mx ≡ None ↔ mx = None.
   Proof. split; [by inversion_clear 1|intros ->; constructor]. Qed.