diff --git a/.changeset/chilled-brooms-leave.md b/.changeset/chilled-brooms-leave.md
new file mode 100644
index 0000000..93f119d
--- /dev/null
+++ b/.changeset/chilled-brooms-leave.md
@@ -0,0 +1,5 @@
+---
+"@openfun/cunningham-react": minor
+---
+
+fix RadioGroup optional prop
diff --git a/packages/react/src/components/Forms/Radio/index.tsx b/packages/react/src/components/Forms/Radio/index.tsx
index 059d3b9..384de34 100644
--- a/packages/react/src/components/Forms/Radio/index.tsx
+++ b/packages/react/src/components/Forms/Radio/index.tsx
@@ -36,7 +36,7 @@ export const RadioGroup = ({
   text,
   rightText,
   style,
-}: PropsWithChildren & FieldProps & { style: React.CSSProperties }) => {
+}: PropsWithChildren & FieldProps & { style?: React.CSSProperties }) => {
   return (
     <Field
       className="c__radio__group c__checkbox__group"