diff --git a/lib/rules/forbid-dom-props.js b/lib/rules/forbid-dom-props.js
index 197f73cee0..d39121187a 100644
--- a/lib/rules/forbid-dom-props.js
+++ b/lib/rules/forbid-dom-props.js
@@ -65,7 +65,7 @@ module.exports = {
     }));
 
     function isForbidden(prop) {
-      return forbid.get(prop) !== undefined;
+      return forbid.has(prop);
     }
 
     return {