diff --git a/searches/binary_search.py b/searches/binary_search.py
index 13b54f498..e78bec862 100644
--- a/searches/binary_search.py
+++ b/searches/binary_search.py
@@ -110,9 +110,9 @@ def binary_search_by_recursion(sorted_collection, item, left, right):
     if sorted_collection[midpoint] == item:
         return midpoint
     elif sorted_collection[midpoint] > item:
-        return binary_search_by_recursion(sorted_collection, item, left, right-1)
+        return binary_search_by_recursion(sorted_collection, item, left, mid - 1)
     else:
-        return binary_search_by_recursion(sorted_collection, item, left+1, right)
+        return binary_search_by_recursion(sorted_collection, item, mid + 1, right)
 
 def __assert_sorted(collection):
     """Check if collection is sorted, if not - raises :py:class:`ValueError`