diff --git a/common/src/main/java/io/netty/util/HashedWheelTimer.java b/common/src/main/java/io/netty/util/HashedWheelTimer.java
index 914b870b33..889d7f1599 100644
--- a/common/src/main/java/io/netty/util/HashedWheelTimer.java
+++ b/common/src/main/java/io/netty/util/HashedWheelTimer.java
@@ -197,11 +197,13 @@ public class HashedWheelTimer implements Timer {
         mask = wheel.length - 1;
 
         // Convert tickDuration to nanos.
-        this.tickDuration = tickDuration = unit.toNanos(tickDuration);
+        this.tickDuration = unit.toNanos(tickDuration);
 
         // Prevent overflow.
-        if (tickDuration == Long.MAX_VALUE || tickDuration >= Long.MAX_VALUE / wheel.length) {
-            throw new IllegalArgumentException("tickDuration is too long: " + tickDuration + ' ' + unit);
+        if (this.tickDuration >= Long.MAX_VALUE / wheel.length) {
+            throw new IllegalArgumentException(String.format(
+                    "tickDuration: %d (expected: 0 < tickDuration in nanos < %d",
+                    tickDuration, Long.MAX_VALUE / wheel.length));
         }
 
         workerThread = threadFactory.newThread(worker);
@@ -339,7 +341,7 @@ public class HashedWheelTimer implements Timer {
             if (workerState.get() == WORKER_STATE_SHUTDOWN) {
                 throw new IllegalStateException("Cannot enqueue after shutdown");
             }
-            final int stopIndex = (int) ((wheelCursor + relativeIndex) & mask);
+            final int stopIndex = (int) (wheelCursor + relativeIndex & mask);
             timeout.stopIndex = stopIndex;
             timeout.remainingRounds = remainingRounds;
             wheel[stopIndex].add(timeout);
@@ -462,7 +464,7 @@ public class HashedWheelTimer implements Timer {
                 //
                 // See https://github.com/netty/netty/issues/356
                 if (PlatformDependent.isWindows()) {
-                    sleepTimeMs = (sleepTimeMs / 10) * 10;
+                    sleepTimeMs = sleepTimeMs / 10 * 10;
                 }
 
                 try {