diff --git a/redisson/src/main/java/org/redisson/client/RedisClient.java b/redisson/src/main/java/org/redisson/client/RedisClient.java
index 4b56e093f..d34297191 100644
--- a/redisson/src/main/java/org/redisson/client/RedisClient.java
+++ b/redisson/src/main/java/org/redisson/client/RedisClient.java
@@ -67,10 +67,10 @@ public final class RedisClient {
     private InetSocketAddress resolvedAddr;
     private final ChannelGroup channels;
 
-    private ExecutorService executor;
+    private final ExecutorService executor;
     private final long commandTimeout;
-    private Timer timer;
-    private RedisClientConfig config;
+    private final Timer timer;
+    private final RedisClientConfig config;
 
     private boolean hasOwnTimer;
     private boolean hasOwnExecutor;