diff --git a/java/com/google/gerrit/server/config/ChangeCleanupConfig.java b/java/com/google/gerrit/server/config/ChangeCleanupConfig.java
index f5c9fc24d8..05594aac74 100644
--- a/java/com/google/gerrit/server/config/ChangeCleanupConfig.java
+++ b/java/com/google/gerrit/server/config/ChangeCleanupConfig.java
@@ -25,11 +25,11 @@ import org.eclipse.jgit.lib.Config;
 
 @Singleton
 public class ChangeCleanupConfig {
-  private static String SECTION = "changeCleanup";
-  private static String KEY_ABANDON_AFTER = "abandonAfter";
-  private static String KEY_ABANDON_IF_MERGEABLE = "abandonIfMergeable";
-  private static String KEY_ABANDON_MESSAGE = "abandonMessage";
-  private static String DEFAULT_ABANDON_MESSAGE =
+  private static final String SECTION = "changeCleanup";
+  private static final String KEY_ABANDON_AFTER = "abandonAfter";
+  private static final String KEY_ABANDON_IF_MERGEABLE = "abandonIfMergeable";
+  private static final String KEY_ABANDON_MESSAGE = "abandonMessage";
+  private static final String DEFAULT_ABANDON_MESSAGE =
       "Auto-Abandoned due to inactivity, see "
           + "${URL}\n"
           + "\n"