diff --git a/config/locales/models/individual/en.yml b/config/locales/models/individual/en.yml
index 46389b7e5..36edcc4b1 100644
--- a/config/locales/models/individual/en.yml
+++ b/config/locales/models/individual/en.yml
@@ -1,5 +1,11 @@
 en:
   activerecord:
+    errors:
+      models:
+        individual:
+          attributes:
+            email:
+              must_be_different_from_mandataire: "must be different from the agent's email"
     attributes:
       individual:
         gender: Gender
diff --git a/config/locales/models/individual/fr.yml b/config/locales/models/individual/fr.yml
index cf0d2f376..217b2aa2c 100644
--- a/config/locales/models/individual/fr.yml
+++ b/config/locales/models/individual/fr.yml
@@ -1,5 +1,11 @@
 fr:
   activerecord:
+    errors:
+      models:
+        individual:
+          attributes:
+            email:
+              must_be_different_from_mandataire: "doit être différent de celui du mandataire"
     attributes:
       individual:
         gender: Civilité