diff --git a/redisson/src/main/java/org/redisson/RedissonSortedSet.java b/redisson/src/main/java/org/redisson/RedissonSortedSet.java
index 70eba86ef..3554b376b 100644
--- a/redisson/src/main/java/org/redisson/RedissonSortedSet.java
+++ b/redisson/src/main/java/org/redisson/RedissonSortedSet.java
@@ -47,7 +47,7 @@ public class RedissonSortedSet<V> extends RedissonObject implements RSortedSet<V
     public static class BinarySearchResult<V> {
 
         private V value;
-        private Integer index;
+        private int index = -1;
 
         public BinarySearchResult(V value) {
             super();