diff --git a/CHANGES b/CHANGES
index 8f53383..4cd1162 100644
--- a/CHANGES
+++ b/CHANGES
@@ -98,6 +98,7 @@
     * [KNOX-1616] - Fix portmapping with Jetty 9.4
     * [KNOX-1639] - java.lang.IllegalStateException: No org.apache.tomcat.InstanceManager set in ServletContext
     * [KNOX-1645] - Improve JSESSIONID handling
+    * [KNOX-1651] - Cleanup IdentityAsserterMessages interfaces
 
 ** Sub-task
     * [KNOX-1449] - Ensure all pom.xml files have same header
diff --git a/gateway-provider-identity-assertion-common/src/main/java/org/apache/knox/gateway/IdentityAsserterMessages.java b/gateway-provider-identity-assertion-common/src/main/java/org/apache/knox/gateway/IdentityAsserterMessages.java
index f72e697..0aee0da 100644
--- a/gateway-provider-identity-assertion-common/src/main/java/org/apache/knox/gateway/IdentityAsserterMessages.java
+++ b/gateway-provider-identity-assertion-common/src/main/java/org/apache/knox/gateway/IdentityAsserterMessages.java
@@ -20,14 +20,9 @@
 import org.apache.knox.gateway.i18n.messages.Message;
 import org.apache.knox.gateway.i18n.messages.MessageLevel;
 import org.apache.knox.gateway.i18n.messages.Messages;
-import org.apache.knox.gateway.i18n.messages.StackTrace;
 
 @Messages(logger="org.apache.knox.gateway")
 public interface IdentityAsserterMessages {
-
-  @Message( level = MessageLevel.WARN, text = "Skipping unencodable parameter {0}={1}, {2}: {3}" )
-  void skippingUnencodableParameter( String name, String value, String encoding, @StackTrace( level = MessageLevel.DEBUG ) Exception e );
-
   @Message( level = MessageLevel.ERROR, text = "Required subject/identity not available.  Check authentication/federation provider for proper configuration." )
   void subjectNotAvailable();
 }
diff --git a/gateway-provider-identity-assertion-concat/src/main/java/org/apache/knox/gateway/ConcatIdentityAsserterMessages.java b/gateway-provider-identity-assertion-concat/src/main/java/org/apache/knox/gateway/ConcatIdentityAsserterMessages.java
deleted file mode 100644
index bde7dd7..0000000
--- a/gateway-provider-identity-assertion-concat/src/main/java/org/apache/knox/gateway/ConcatIdentityAsserterMessages.java
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.apache.knox.gateway;
-
-import org.apache.knox.gateway.i18n.messages.Message;
-import org.apache.knox.gateway.i18n.messages.MessageLevel;
-import org.apache.knox.gateway.i18n.messages.Messages;
-import org.apache.knox.gateway.i18n.messages.StackTrace;
-
-@Messages(logger="org.apache.knox.gateway")
-public interface ConcatIdentityAsserterMessages {
-
-  @Message( level = MessageLevel.WARN, text = "Skipping unencodable parameter {0}={1}, {2}: {3}" )
-  void skippingUnencodableParameter( String name, String value, String encoding, @StackTrace( level = MessageLevel.DEBUG ) Exception e );
-
-}
diff --git a/gateway-provider-identity-assertion-pseudo/src/main/java/org/apache/knox/gateway/IdentityAsserterMessages.java b/gateway-provider-identity-assertion-pseudo/src/main/java/org/apache/knox/gateway/IdentityAsserterMessages.java
deleted file mode 100644
index 451742d..0000000
--- a/gateway-provider-identity-assertion-pseudo/src/main/java/org/apache/knox/gateway/IdentityAsserterMessages.java
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.apache.knox.gateway;
-
-import org.apache.knox.gateway.i18n.messages.Message;
-import org.apache.knox.gateway.i18n.messages.MessageLevel;
-import org.apache.knox.gateway.i18n.messages.Messages;
-import org.apache.knox.gateway.i18n.messages.StackTrace;
-
-@Messages(logger="org.apache.knox.gateway")
-public interface IdentityAsserterMessages {
-
-  @Message( level = MessageLevel.WARN, text = "Skipping unencodable parameter {0}={1}, {2}: {3}" )
-  void skippingUnencodableParameter( String name, String value, String encoding, @StackTrace( level = MessageLevel.DEBUG ) Exception e );
-
-}