diff --git a/core/src/main/java/org/jivesoftware/smack/filter/AndFilter.java b/core/src/main/java/org/jivesoftware/smack/filter/AndFilter.java
index 6b00fcd4d..ac5bb259f 100644
--- a/core/src/main/java/org/jivesoftware/smack/filter/AndFilter.java
+++ b/core/src/main/java/org/jivesoftware/smack/filter/AndFilter.java
@@ -17,10 +17,11 @@
 
 package org.jivesoftware.smack.filter;
 
-import org.jivesoftware.smack.packet.Packet;
-
-import java.util.List;
 import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import org.jivesoftware.smack.packet.Packet;
 
 /**
  * Implements the logical AND operation over two or more packet filters.
@@ -33,14 +34,14 @@ public class AndFilter implements PacketFilter {
     /**
      * The list of filters.
      */
-    private List<PacketFilter> filters = new ArrayList<PacketFilter>();
+    private final List<PacketFilter> filters;
 
     /**
      * Creates an empty AND filter. Filters should be added using the
      * {@link #addFilter(PacketFilter)} method.
      */
     public AndFilter() {
-
+        filters = new ArrayList<PacketFilter>();
     }
 
     /**
@@ -56,8 +57,8 @@ public class AndFilter implements PacketFilter {
             if(filter == null) {
                 throw new IllegalArgumentException("Parameter cannot be null.");
             }
-            this.filters.add(filter);
         }
+        this.filters = new ArrayList<PacketFilter>(Arrays.asList(filters));
     }
 
     /**
diff --git a/core/src/main/java/org/jivesoftware/smack/filter/OrFilter.java b/core/src/main/java/org/jivesoftware/smack/filter/OrFilter.java
index 141fcc9ac..e67977b50 100644
--- a/core/src/main/java/org/jivesoftware/smack/filter/OrFilter.java
+++ b/core/src/main/java/org/jivesoftware/smack/filter/OrFilter.java
@@ -17,6 +17,10 @@
 
 package org.jivesoftware.smack.filter;
 
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
 import org.jivesoftware.smack.packet.Packet;
 
 /**
@@ -27,39 +31,34 @@ import org.jivesoftware.smack.packet.Packet;
  */
 public class OrFilter implements PacketFilter {
 
-    /**
-     * The current number of elements in the filter.
-     */
-    private int size;
-
     /**
      * The list of filters.
      */
-    private PacketFilter [] filters;
+    private final List<PacketFilter> filters;
 
     /**
      * Creates an empty OR filter. Filters should be added using the
      * {@link #addFilter(PacketFilter)} method.
      */
     public OrFilter() {
-        size = 0;
-        filters = new PacketFilter[3];
+        filters = new ArrayList<PacketFilter>();
     }
 
     /**
-     * Creates an OR filter using the two specified filters.
+     * Creates an OR filter using the specified filters.
      *
-     * @param filter1 the first packet filter.
-     * @param filter2 the second packet filter.
+     * @param filters the filters to add.
      */
-    public OrFilter(PacketFilter filter1, PacketFilter filter2) {
-        if (filter1 == null || filter2 == null) {
-            throw new IllegalArgumentException("Parameters cannot be null.");
+    public OrFilter(PacketFilter... filters) {
+        if (filters == null) {
+            throw new IllegalArgumentException("Parameter cannot be null.");
         }
-        size = 2;
-        filters = new PacketFilter[2];
-        filters[0] = filter1;
-        filters[1] = filter2;
+        for(PacketFilter filter : filters) {
+            if(filter == null) {
+                throw new IllegalArgumentException("Parameter cannot be null.");
+            }
+        }
+        this.filters = new ArrayList<PacketFilter>(Arrays.asList(filters));
     }
 
     /**
@@ -72,22 +71,12 @@ public class OrFilter implements PacketFilter {
         if (filter == null) {
             throw new IllegalArgumentException("Parameter cannot be null.");
         }
-        // If there is no more room left in the filters array, expand it.
-        if (size == filters.length) {
-            PacketFilter [] newFilters = new PacketFilter[filters.length+2];
-            for (int i=0; i<filters.length; i++) {
-                newFilters[i] = filters[i];
-            }
-            filters = newFilters;
-        }
-        // Add the new filter to the array.
-        filters[size] = filter;
-        size++;
+        filters.add(filter);
     }
 
     public boolean accept(Packet packet) {
-        for (int i=0; i<size; i++) {
-            if (filters[i].accept(packet)) {
+        for (PacketFilter filter : filters) {
+            if (filter.accept(packet)) {
                 return true;
             }
         }
diff --git a/legacy/src/main/java/org/jivesoftware/smackx/workgroup/agent/AgentSession.java b/legacy/src/main/java/org/jivesoftware/smackx/workgroup/agent/AgentSession.java
index 5975cdee1..952097fd1 100644
--- a/legacy/src/main/java/org/jivesoftware/smackx/workgroup/agent/AgentSession.java
+++ b/legacy/src/main/java/org/jivesoftware/smackx/workgroup/agent/AgentSession.java
@@ -107,11 +107,11 @@ public class AgentSession {
         queueUsersListeners = new ArrayList<QueueUsersListener>();
 
         // Create a filter to listen for packets we're interested in.
-        OrFilter filter = new OrFilter();
-        filter.addFilter(new PacketTypeFilter(OfferRequestProvider.OfferRequestPacket.class));
-        filter.addFilter(new PacketTypeFilter(OfferRevokeProvider.OfferRevokePacket.class));
-        filter.addFilter(new PacketTypeFilter(Presence.class));
-        filter.addFilter(new PacketTypeFilter(Message.class));
+        OrFilter filter = new OrFilter(
+                        new PacketTypeFilter(OfferRequestProvider.OfferRequestPacket.class),
+                        new PacketTypeFilter(OfferRevokeProvider.OfferRevokePacket.class),
+                        new PacketTypeFilter(Presence.class),
+                        new PacketTypeFilter(Message.class));
 
         packetListener = new PacketListener() {
             public void processPacket(Packet packet) {