diff --git a/src/main/java/com/zaxxer/hikari/pool/PoolBase.java b/src/main/java/com/zaxxer/hikari/pool/PoolBase.java
index 8ddf569b..44bc02ec 100644
--- a/src/main/java/com/zaxxer/hikari/pool/PoolBase.java
+++ b/src/main/java/com/zaxxer/hikari/pool/PoolBase.java
@@ -1,6 +1,11 @@
 package com.zaxxer.hikari.pool;
 
 import static com.zaxxer.hikari.util.UtilityElf.createInstance;
+import static com.zaxxer.hikari.pool.ProxyConnection.DIRTY_BIT_CATALOG;
+import static com.zaxxer.hikari.pool.ProxyConnection.DIRTY_BIT_READONLY;
+import static com.zaxxer.hikari.pool.ProxyConnection.DIRTY_BIT_ISOLATION;
+import static com.zaxxer.hikari.pool.ProxyConnection.DIRTY_BIT_AUTOCOMMIT;
+import static com.zaxxer.hikari.pool.ProxyConnection.DIRTY_BIT_NETTIMEOUT;
 
 import java.lang.management.ManagementFactory;
 import java.sql.Connection;
@@ -170,32 +175,32 @@ abstract class PoolBase
    {
       int resetBits = 0;
 
-      if ((dirtyBits & 0b00001) != 0 && proxyConnection.getReadOnlyState() != isReadOnly) {
+      if ((dirtyBits & DIRTY_BIT_READONLY) != 0 && proxyConnection.getReadOnlyState() != isReadOnly) {
          connection.setReadOnly(isReadOnly);
-         resetBits |= 0b00001;
+         resetBits |= DIRTY_BIT_READONLY;
       }
 
-      if ((dirtyBits & 0b00010) != 0 && proxyConnection.getAutoCommitState() != isAutoCommit) {
+      if ((dirtyBits & DIRTY_BIT_AUTOCOMMIT) != 0 && proxyConnection.getAutoCommitState() != isAutoCommit) {
          connection.setAutoCommit(isAutoCommit);
-         resetBits |= 0b00010;
+         resetBits |= DIRTY_BIT_AUTOCOMMIT;
       }
 
-      if ((dirtyBits & 0b00100) != 0 && proxyConnection.getTransactionIsolationState() != transactionIsolation) {
+      if ((dirtyBits & DIRTY_BIT_ISOLATION) != 0 && proxyConnection.getTransactionIsolationState() != transactionIsolation) {
          connection.setTransactionIsolation(transactionIsolation);
-         resetBits |= 0b00100;
+         resetBits |= DIRTY_BIT_ISOLATION;
       }
 
-      if ((dirtyBits & 0b01000) != 0) {
+      if ((dirtyBits & DIRTY_BIT_CATALOG) != 0) {
          final String currentCatalog = proxyConnection.getCatalogState();
          if ((currentCatalog != null && !currentCatalog.equals(catalog)) || (currentCatalog == null && catalog != null)) {
             connection.setCatalog(catalog);
-            resetBits |= 0b01000;
+            resetBits |= DIRTY_BIT_CATALOG;
          }
       }
 
-      if ((dirtyBits & 0b10000) != 0 && proxyConnection.getNetworkTimeoutState() != networkTimeout) {
+      if ((dirtyBits & DIRTY_BIT_NETTIMEOUT) != 0 && proxyConnection.getNetworkTimeoutState() != networkTimeout) {
          setNetworkTimeout(connection, networkTimeout);
-         resetBits |= 0b10000;
+         resetBits |= DIRTY_BIT_NETTIMEOUT;
       }
       
       if (LOGGER.isDebugEnabled()) {
diff --git a/src/main/java/com/zaxxer/hikari/pool/ProxyConnection.java b/src/main/java/com/zaxxer/hikari/pool/ProxyConnection.java
index ef24a5a5..6d6961cc 100644
--- a/src/main/java/com/zaxxer/hikari/pool/ProxyConnection.java
+++ b/src/main/java/com/zaxxer/hikari/pool/ProxyConnection.java
@@ -43,6 +43,12 @@ import com.zaxxer.hikari.util.FastList;
  */
 public abstract class ProxyConnection implements Connection
 {
+   static final int DIRTY_BIT_READONLY   = 0b00001;
+   static final int DIRTY_BIT_AUTOCOMMIT = 0b00010;
+   static final int DIRTY_BIT_ISOLATION  = 0b00100;
+   static final int DIRTY_BIT_CATALOG    = 0b01000;
+   static final int DIRTY_BIT_NETTIMEOUT = 0b10000;
+   
    private static final Logger LOGGER;
    private static final Set<String> SQL_ERRORS;
    private static final ClockSource clockSource;
@@ -371,7 +377,7 @@ public abstract class ProxyConnection implements Connection
    {
       delegate.setAutoCommit(autoCommit);
       isAutoCommit = autoCommit;
-      dirtyBits |= 0b00010;
+      dirtyBits |= DIRTY_BIT_AUTOCOMMIT;
    }
 
    /** {@inheritDoc} */
@@ -380,7 +386,7 @@ public abstract class ProxyConnection implements Connection
    {
       delegate.setReadOnly(readOnly);
       isReadOnly = readOnly;
-      dirtyBits |= 0b00001;
+      dirtyBits |= DIRTY_BIT_READONLY;
    }
 
    /** {@inheritDoc} */
@@ -389,7 +395,7 @@ public abstract class ProxyConnection implements Connection
    {
       delegate.setTransactionIsolation(level);
       transactionIsolation = level;
-      dirtyBits |= 0b00100;
+      dirtyBits |= DIRTY_BIT_ISOLATION;
    }
 
    /** {@inheritDoc} */
@@ -398,7 +404,7 @@ public abstract class ProxyConnection implements Connection
    {
       delegate.setCatalog(catalog);
       dbcatalog = catalog;
-      dirtyBits |= 0b01000;
+      dirtyBits |= DIRTY_BIT_CATALOG;
    }
 
    /** {@inheritDoc} */
@@ -407,7 +413,7 @@ public abstract class ProxyConnection implements Connection
    {
       delegate.setNetworkTimeout(executor, milliseconds);
       networkTimeout = milliseconds;
-      dirtyBits |= 0b10000;
+      dirtyBits |= DIRTY_BIT_NETTIMEOUT;
    }
 
    /** {@inheritDoc} */