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diff --git a/theories/Classes/Morphisms_Relations.v b/theories/Classes/Morphisms_Relations.v
index 24b8d636..4654e654 100644
--- a/theories/Classes/Morphisms_Relations.v
+++ b/theories/Classes/Morphisms_Relations.v
@@ -12,6 +12,7 @@
Institution: LRI, CNRS UMR 8623 - UniversitÃcopyright Paris Sud
91405 Orsay, France *)
+Require Import Relation_Definitions.
Require Import Coq.Classes.Morphisms.
Require Import Coq.Program.Program.