diff --git a/handler/src/main/java/io/netty/handler/timeout/ReadTimeoutHandler.java b/handler/src/main/java/io/netty/handler/timeout/ReadTimeoutHandler.java
index 50d20e4191..47688f669e 100644
--- a/handler/src/main/java/io/netty/handler/timeout/ReadTimeoutHandler.java
+++ b/handler/src/main/java/io/netty/handler/timeout/ReadTimeoutHandler.java
@@ -211,10 +211,9 @@ public class ReadTimeoutHandler extends ChannelHandlerAdapter {
                 return;
             }
 
-            long currentTime = System.nanoTime();
             long nextDelay = timeoutNanos;
             if (!reading) {
-                nextDelay -= currentTime - lastReadTime;
+                nextDelay -= System.nanoTime() - lastReadTime;
             }
 
             if (nextDelay <= 0) {