diff --git a/packages/ra-core/src/i18n/TranslationMessages.ts b/packages/ra-core/src/i18n/TranslationMessages.ts
index 1cbe8451b9f..9d4a9f78b42 100644
--- a/packages/ra-core/src/i18n/TranslationMessages.ts
+++ b/packages/ra-core/src/i18n/TranslationMessages.ts
@@ -182,6 +182,7 @@ export interface TranslationMessages extends StringMap {
             email: string;
             oneOf: string;
             regex: string;
+            unique: string;
         };
         saved_queries: {
             label: string;