diff --git a/examples/docs/src/components/Header/LanguageSelect.tsx b/examples/docs/src/components/Header/LanguageSelect.tsx
index 3c0244e0d..7f5f2e26b 100644
--- a/examples/docs/src/components/Header/LanguageSelect.tsx
+++ b/examples/docs/src/components/Header/LanguageSelect.tsx
@@ -36,7 +36,7 @@ const LanguageSelect: FunctionComponent<{ lang: string }> = ({ lang }) => {
 			>
 				{Object.entries(KNOWN_LANGUAGES).map(([key, value]) => {
 					return (
-						<option value={value}>
+						<option value={value} key={value}>
 							<span>{key}</span>
 						</option>
 					);