diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9080e55e..6e28c0e9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ This project aims to adhere to [Semantic Versioning](http://semver.org/).
  - Object content verification of standard PUT requests was being
    skipped if the server [omitted the computed MD5](https://github.com/joyent/java-manta/issues/298)
    from the response.
+ - [`mvn integration-test site` fails enforce-ban-duplicate-classes](https://github.com/joyent/java-manta/issues/270)
 
 ## [3.1.5] - 2017-07-28
 ### Fixed
diff --git a/java-manta-cli/pom.xml b/java-manta-cli/pom.xml
index f2cc6db9..70be2ae5 100644
--- a/java-manta-cli/pom.xml
+++ b/java-manta-cli/pom.xml
@@ -22,6 +22,61 @@
             <groupId>com.joyent.manta</groupId>
             <artifactId>java-manta-client</artifactId>
             <version>3.1.7-SNAPSHOT</version>
+
+            <!-- If you add a dependency to java-manta-client that is shaded,
+                 you will have to add it as an exclusion below because the
+                 Maven enforcer plugin is simpleminded and it will detect
+                 the shaded class and the dependency jar as conflicting. -->
+            <exclusions>
+                <exclusion>
+                    <groupId>com.joyent.http-signature</groupId>
+                    <artifactId>apache-http-client-signature</artifactId>
+                </exclusion>
+                <exclusion>
+                    <groupId>org.apache.httpcomponents</groupId>
+                    <artifactId>httpclient</artifactId>
+                </exclusion>
+                <exclusion>
+                    <groupId>org.apache.commons</groupId>
+                    <artifactId>commons-lang3</artifactId>
+                </exclusion>
+                <exclusion>
+                    <groupId>org.apache.commons</groupId>
+                    <artifactId>commons-collections4</artifactId>
+                </exclusion>
+                <exclusion>
+                    <groupId>commons-io</groupId>
+                    <artifactId>commons-io</artifactId>
+                </exclusion>
+                <exclusion>
+                    <groupId>commons-codec</groupId>
+                    <artifactId>commons-codec</artifactId>
+                </exclusion>
+                <exclusion>
+                    <groupId>com.fasterxml.uuid</groupId>
+                    <artifactId>java-uuid-generator</artifactId>
+                </exclusion>
+                <exclusion>
+                    <groupId>com.fasterxml.jackson.core</groupId>
+                    <artifactId>jackson-core</artifactId>
+                </exclusion>
+                <exclusion>
+                    <groupId>com.fasterxml.jackson.core</groupId>
+                    <artifactId>jackson-databind</artifactId>
+                </exclusion>
+                <exclusion>
+                    <groupId>com.fasterxml.jackson.datatype</groupId>
+                    <artifactId>jackson-datatype-jsr310</artifactId>
+                </exclusion>
+                <exclusion>
+                    <groupId>com.squareup.jnagmp</groupId>
+                    <artifactId>bouncycastle-rsa</artifactId>
+                </exclusion>
+                <exclusion>
+                    <groupId>com.twmacinta</groupId>
+                    <artifactId>fast-md5</artifactId>
+                </exclusion>
+            </exclusions>
         </dependency>
         <dependency>
             <groupId>ch.qos.logback</groupId>
diff --git a/java-manta-client-kryo-serialization/pom.xml b/java-manta-client-kryo-serialization/pom.xml
index 322e79de..f415cbaa 100644
--- a/java-manta-client-kryo-serialization/pom.xml
+++ b/java-manta-client-kryo-serialization/pom.xml
@@ -20,50 +20,16 @@
             <groupId>com.joyent.manta</groupId>
             <artifactId>java-manta-client</artifactId>
             <version>3.1.7-SNAPSHOT</version>
+
+            <!-- If you add a dependency to java-manta-client that is shaded and
+                 not relocated, you will have to add it as an exclusion below
+                 because the Maven enforcer plugin is simpleminded and it will
+                 detect the shaded class and the dependency jar as conflicting.
+            -->
             <exclusions>
                 <exclusion>
-                    <groupId>com.joyent.http-signature</groupId>
-                    <artifactId>apache-http-client-signature</artifactId>
-                </exclusion>
-                <exclusion>
-                    <groupId>org.apache.httpcomponents</groupId>
-                    <artifactId>httpclient</artifactId>
-                </exclusion>
-                <exclusion>
-                    <groupId>org.apache.commons</groupId>
-                    <artifactId>commons-lang3</artifactId>
-                </exclusion>
-                <exclusion>
-                    <groupId>org.apache.commons</groupId>
-                    <artifactId>commons-collections4</artifactId>
-                </exclusion>
-                <exclusion>
-                    <groupId>commons-io</groupId>
-                    <artifactId>commons-io</artifactId>
-                </exclusion>
-                <exclusion>
-                    <groupId>commons-codec</groupId>
-                    <artifactId>commons-codec</artifactId>
-                </exclusion>
-                <exclusion>
-                    <groupId>com.fasterxml.uuid</groupId>
-                    <artifactId>java-uuid-generator</artifactId>
-                </exclusion>
-                <exclusion>
-                    <groupId>com.fasterxml.jackson.core</groupId>
-                    <artifactId>jackson-core</artifactId>
-                </exclusion>
-                <exclusion>
-                    <groupId>com.fasterxml.jackson.core</groupId>
-                    <artifactId>jackson-databind</artifactId>
-                </exclusion>
-                <exclusion>
-                    <groupId>com.fasterxml.jackson.datatype</groupId>
-                    <artifactId>jackson-datatype-jsr310</artifactId>
-                </exclusion>
-                <exclusion>
-                    <groupId>com.squareup.jnagmp</groupId>
-                    <artifactId>bouncycastle-rsa</artifactId>
+                    <groupId>com.twmacinta</groupId>
+                    <artifactId>fast-md5</artifactId>
                 </exclusion>
             </exclusions>
         </dependency>
@@ -120,6 +86,24 @@
             </exclusions>
         </dependency>
 
+        <dependency>
+            <groupId>org.objenesis</groupId>
+            <artifactId>objenesis</artifactId>
+            <version>${dependency.objenesis.version}</version>
+            <scope>compile</scope>
+        </dependency>
+
+        <!-- Fast-md5 is added in the provided scope because it is shaded and
+             not relocated. We don't want it to be transitively passed on as a
+             dependency, so it is used in the runtime scope.
+        -->
+        <dependency>
+            <groupId>com.twmacinta</groupId>
+            <artifactId>fast-md5</artifactId>
+            <version>${dependency.fast-md5.version}</version>
+            <scope>provided</scope>
+        </dependency>
+
         <!-- These dependencies are declared at the module level because we can not
      inherit exclusions from the parent. -->
         <dependency>
diff --git a/pom.xml b/pom.xml
index c47a9d5f..9221a432 100644
--- a/pom.xml
+++ b/pom.xml
@@ -120,7 +120,7 @@
         <maven-dependency-plugin.version>2.10</maven-dependency-plugin.version>
         <maven-deploy-plugin.version>2.8.2</maven-deploy-plugin.version>
         <maven-enforcer-plugin.version>1.4.1</maven-enforcer-plugin.version>
-        <maven-extra-enforcer-rules.version>1.0-beta-5</maven-extra-enforcer-rules.version>
+        <maven-extra-enforcer-rules.version>1.0-beta-6</maven-extra-enforcer-rules.version>
         <maven-gpg-plugin.version>1.6</maven-gpg-plugin.version>
         <maven-install-plugin.version>2.5.2</maven-install-plugin.version>
         <maven-jar-plugin.version>3.0.2</maven-jar-plugin.version>
@@ -351,6 +351,20 @@
                             <rules>
                                 <banDuplicateClasses>
                                     <findAllDuplicates>true</findAllDuplicates>
+                                    <!-- Maven enforcer erroneously reports that the below
+                                         classes are duplicated in the following jars:
+
+                                         com.joyent.manta:java-manta-client:jar:3.1.4-SNAPSHOT:compile
+                                         com.twmacinta:fast-md5:jar:2.7.1:compile
+
+                                         The fast-md5 jar will be present during the test phase, but
+                                         it will not be part of the final artifact.
+                                    -->
+                                    <ignoreClasses>
+                                        <ignoreClass>com.twmacinta.util.MD5State</ignoreClass>
+                                        <ignoreClass>com.twmacinta.util.MD5InputStream</ignoreClass>
+                                        <ignoreClass>com.twmacinta.util.MD5</ignoreClass>
+                                    </ignoreClasses>
                                 </banDuplicateClasses>
                             </rules>
                             <fail>true</fail>