diff --git a/smack-experimental/src/main/java/org/jivesoftware/smackx/sid/StableUniqueStanzaIdManager.java b/smack-experimental/src/main/java/org/jivesoftware/smackx/sid/StableUniqueStanzaIdManager.java
index 677a38910..85c08c437 100644
--- a/smack-experimental/src/main/java/org/jivesoftware/smackx/sid/StableUniqueStanzaIdManager.java
+++ b/smack-experimental/src/main/java/org/jivesoftware/smackx/sid/StableUniqueStanzaIdManager.java
@@ -27,7 +27,6 @@ import org.jivesoftware.smack.XMPPConnectionRegistry;
 import org.jivesoftware.smack.filter.AndFilter;
 import org.jivesoftware.smack.filter.MessageTypeFilter;
 import org.jivesoftware.smack.filter.NotFilter;
-import org.jivesoftware.smack.filter.StanzaExtensionFilter;
 import org.jivesoftware.smack.filter.StanzaFilter;
 import org.jivesoftware.smack.filter.ToTypeFilter;
 import org.jivesoftware.smack.packet.Message;
@@ -46,8 +45,6 @@ public final class StableUniqueStanzaIdManager extends Manager {
             MessageTypeFilter.NORMAL_OR_CHAT_OR_HEADLINE,
             ToTypeFilter.ENTITY_FULL_OR_BARE_JID);
 
-    private static final StanzaFilter ORIGIN_ID_FILTER = new StanzaExtensionFilter(OriginIdElement.ELEMENT, NAMESPACE);
-
     // Listener for outgoing stanzas that adds origin-ids to outgoing stanzas.
     private final StanzaListener stanzaListener = new StanzaListener() {
         @Override