diff --git a/algorithms/searching/binary-search/binary-search.js b/algorithms/searching/binary-search/binary-search.js
index b40ceb9..837d2fe 100644
--- a/algorithms/searching/binary-search/binary-search.js
+++ b/algorithms/searching/binary-search/binary-search.js
@@ -44,7 +44,7 @@ function binarySearch(items, value){
         }
         
         //recalculate middle
-        middle = Math.floor((stopIndex + startIndex)/2);    
+        middle = startIndex + Math.floor((stopIndex - startIndex)/2);    
     }
 
     //make sure it's the right value