diff --git a/src/components/Check.tsx b/src/components/Check.tsx
index 36a809f..47453ad 100644
--- a/src/components/Check.tsx
+++ b/src/components/Check.tsx
@@ -14,7 +14,7 @@ interface CheckBoxProps {
   name?: string;
   checked?: boolean;
   disabled?: boolean;
-  onChange?: (checked: boolean) => void;
+  onChange?: (checked?: boolean) => void;
 }
 
 const Check: ParentComponent<CheckBoxProps> = (props) => {
diff --git a/src/components/Radio.tsx b/src/components/Radio.tsx
index 2c061ce..5d6f19b 100644
--- a/src/components/Radio.tsx
+++ b/src/components/Radio.tsx
@@ -14,7 +14,7 @@ interface RadioProps {
   name?: string;
   checked?: boolean;
   disabled?: boolean;
-  onChange?: (value: boolean) => void;
+  onChange?: (value?: boolean) => void;
 }
 
 const Radio: ParentComponent<RadioProps> = (props) => {