diff --git a/transport/src/main/java/io/netty/channel/nio/NioEventLoop.java b/transport/src/main/java/io/netty/channel/nio/NioEventLoop.java
index 16695c8f7e..100065f350 100644
--- a/transport/src/main/java/io/netty/channel/nio/NioEventLoop.java
+++ b/transport/src/main/java/io/netty/channel/nio/NioEventLoop.java
@@ -59,7 +59,7 @@ public final class NioEventLoop extends SingleThreadEventLoop {
 
     private static final int CLEANUP_INTERVAL = 256; // XXX Hard-coded value, but won't need customization.
 
-    private static final boolean DISABLE_KEYSET_OPTIMIZATION =
+    private static final boolean DISABLE_KEY_SET_OPTIMIZATION =
             SystemPropertyUtil.getBoolean("io.netty.noKeySetOptimization", false);
 
     private static final int MIN_PREMATURE_SELECTOR_RETURNS = 3;
@@ -79,8 +79,8 @@ public final class NioEventLoop extends SingleThreadEventLoop {
     // - https://github.com/netty/netty/issues/203
     static {
         final String key = "sun.nio.ch.bugLevel";
-        final String buglevel = SystemPropertyUtil.get(key);
-        if (buglevel == null) {
+        final String bugLevel = SystemPropertyUtil.get(key);
+        if (bugLevel == null) {
             try {
                 AccessController.doPrivileged(new PrivilegedAction<Void>() {
                     @Override
@@ -102,7 +102,7 @@ public final class NioEventLoop extends SingleThreadEventLoop {
         SELECTOR_AUTO_REBUILD_THRESHOLD = selectorAutoRebuildThreshold;
 
         if (logger.isDebugEnabled()) {
-            logger.debug("-Dio.netty.noKeySetOptimization: {}", DISABLE_KEYSET_OPTIMIZATION);
+            logger.debug("-Dio.netty.noKeySetOptimization: {}", DISABLE_KEY_SET_OPTIMIZATION);
             logger.debug("-Dio.netty.selectorAutoRebuildThreshold: {}", SELECTOR_AUTO_REBUILD_THRESHOLD);
         }
     }
@@ -169,7 +169,7 @@ public final class NioEventLoop extends SingleThreadEventLoop {
             throw new ChannelException("failed to open a new selector", e);
         }
 
-        if (DISABLE_KEYSET_OPTIMIZATION) {
+        if (DISABLE_KEY_SET_OPTIMIZATION) {
             return new SelectorTuple(unwrappedSelector);
         }