diff --git a/mon-entreprise/source/components/conversation/RuleInput.tsx b/mon-entreprise/source/components/conversation/RuleInput.tsx
index 43e9202ff..6d76771fb 100644
--- a/mon-entreprise/source/components/conversation/RuleInput.tsx
+++ b/mon-entreprise/source/components/conversation/RuleInput.tsx
@@ -29,6 +29,10 @@ type Props<Name extends string = DottedName> = Omit<
 	// a build-in logic in the engine, by setting the "applicability" of
 	// suggestions.
 	showSuggestions?: boolean
+	// TODO: having an option seems undesirable, but it's the easier way to
+	// implement this behavior currently
+	// cf .https://github.com/betagouv/mon-entreprise/issues/1489#issuecomment-823058710
+	showDefaultDateValue?: boolean
 	useSwitch?: boolean
 	isTarget?: boolean
 	onSubmit?: (source: string) => void
@@ -58,6 +62,7 @@ export default function RuleInput({
 	isTarget = false,
 	showSuggestions = true,
 	onSubmit = () => null,
+	showDefaultDateValue = false,
 	modifiers = {},
 	...props
 }: Props<DottedName>) {
@@ -69,7 +74,7 @@ export default function RuleInput({
 	const commonProps: InputProps<DottedName> = {
 		dottedName,
 		value,
-		missing: !!evaluation.missingVariables[dottedName],
+		missing: !showDefaultDateValue && !!evaluation.missingVariables[dottedName],
 		onChange,
 		title: rule.title,
 		id: props.id ?? dottedName,
diff --git a/mon-entreprise/source/pages/Simulateurs/ISSimulation.tsx b/mon-entreprise/source/pages/Simulateurs/ISSimulation.tsx
index 4f63ad610..0ab8fe365 100644
--- a/mon-entreprise/source/pages/Simulateurs/ISSimulation.tsx
+++ b/mon-entreprise/source/pages/Simulateurs/ISSimulation.tsx
@@ -77,6 +77,7 @@ function ExerciceDate() {
 				Exercice du{' '}
 				<RuleInput
 					dottedName={'entreprise . exercice . début'}
+					showDefaultDateValue={true}
 					onChange={(x) =>
 						dispatch(updateSituation('entreprise . exercice . début', x))
 					}
@@ -84,6 +85,7 @@ function ExerciceDate() {
 				au{' '}
 				<RuleInput
 					dottedName={'entreprise . exercice . fin'}
+					showDefaultDateValue={true}
 					onChange={(x) =>
 						dispatch(updateSituation('entreprise . exercice . fin', x))
 					}