diff --git a/packages/react-dom/src/shared/DOMProperty.js b/packages/react-dom/src/shared/DOMProperty.js
index e39f77204f..5801f4428b 100644
--- a/packages/react-dom/src/shared/DOMProperty.js
+++ b/packages/react-dom/src/shared/DOMProperty.js
@@ -183,9 +183,9 @@ export function shouldSetAttribute(name, value) {
     return false;
   }
   if (
+    name.length > 2 &&
     (name[0] === 'o' || name[0] === 'O') &&
-    (name[1] === 'n' || name[1] === 'N') &&
-    name.length > 2
+    (name[1] === 'n' || name[1] === 'N')
   ) {
     return false;
   }