diff --git a/packages/next-server/lib/head.js b/packages/next-server/lib/head.js
index 4e0b2570..2aa1c118 100644
--- a/packages/next-server/lib/head.js
+++ b/packages/next-server/lib/head.js
@@ -100,4 +100,12 @@ function unique () {
   }
 }
 
+if (process.env.NODE_ENV === 'development') {
+  const exact = require('prop-types-exact')
+
+  Head.propTypes = exact({
+    children: PropTypes.oneOfType([PropTypes.element, PropTypes.arrayOf(PropTypes.element)]).isRequired
+  })
+}
+
 export default sideEffect(reduceComponents, onStateChange, mapOnServer)(Head)