diff --git a/lodash.js b/lodash.js
index ab329b843..df1143462 100644
--- a/lodash.js
+++ b/lodash.js
@@ -3706,7 +3706,7 @@
      * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
      */
     function isLength(value) {
-      return typeof value == 'number' && value > -1 && value <= MAX_SAFE_INTEGER;
+      return typeof value == 'number' && value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
     }
 
     /**