diff --git a/lib/chai/core/assertions.js b/lib/chai/core/assertions.js
index b6dded8e4..97a85d124 100644
--- a/lib/chai/core/assertions.js
+++ b/lib/chai/core/assertions.js
@@ -871,7 +871,7 @@ module.exports = function (chai, _) {
   }
 
   Assertion.addChainableMethod('length', assertLength, assertLengthChain);
-  Assertion.addMethod('lengthOf', assertLength, assertLengthChain);
+  Assertion.addMethod('lengthOf', assertLength);
 
   /**
    * ### .match(regexp)