diff --git a/org.eclipse.jgit/.settings/.api_filters b/org.eclipse.jgit/.settings/.api_filters
index e51bf20c2..b7b49bc65 100644
--- a/org.eclipse.jgit/.settings/.api_filters
+++ b/org.eclipse.jgit/.settings/.api_filters
@@ -1,5 +1,12 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <component id="org.eclipse.jgit" version="2">
+    <resource path="src/org/eclipse/jgit/lib/ConfigConstants.java" type="org.eclipse.jgit.lib.ConfigConstants">
+        <filter id="337768515">
+            <message_arguments>
+                <message_argument value="org.eclipse.jgit.lib.ConfigConstants"/>
+            </message_arguments>
+        </filter>
+    </resource>
     <resource path="src/org/eclipse/jgit/lib/ObjectIdSerializer.java" type="org.eclipse.jgit.lib.ObjectIdSerializer">
         <filter id="1141899266">
             <message_arguments>
@@ -16,4 +23,11 @@
             </message_arguments>
         </filter>
     </resource>
+    <resource path="src/org/eclipse/jgit/transport/GitProtocolConstants.java" type="org.eclipse.jgit.transport.GitProtocolConstants">
+        <filter id="337768515">
+            <message_arguments>
+                <message_argument value="org.eclipse.jgit.transport.GitProtocolConstants"/>
+            </message_arguments>
+        </filter>
+    </resource>
 </component>
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/lib/ConfigConstants.java b/org.eclipse.jgit/src/org/eclipse/jgit/lib/ConfigConstants.java
index 5a790350b..d4a0280da 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/lib/ConfigConstants.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/lib/ConfigConstants.java
@@ -49,7 +49,7 @@ package org.eclipse.jgit.lib;
  * configuration keys
  */
 @SuppressWarnings("nls")
-public class ConfigConstants {
+public final class ConfigConstants {
 	/** The "core" section */
 	public static final String CONFIG_CORE_SECTION = "core";
 
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/GitProtocolConstants.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/GitProtocolConstants.java
index 86740d42c..760ac6c1d 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/GitProtocolConstants.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/GitProtocolConstants.java
@@ -50,7 +50,7 @@ package org.eclipse.jgit.transport;
  *
  * @since 3.2
  */
-public class GitProtocolConstants {
+public final class GitProtocolConstants {
 	/**
 	 * Include tags if we are also including the referenced objects.
 	 *