diff --git a/src/main/java/org/apache/maven/shared/utils/cli/Commandline.java b/src/main/java/org/apache/maven/shared/utils/cli/Commandline.java
index 02e1ec44..c1f763ea 100644
--- a/src/main/java/org/apache/maven/shared/utils/cli/Commandline.java
+++ b/src/main/java/org/apache/maven/shared/utils/cli/Commandline.java
@@ -61,7 +61,7 @@
  * @author thomas.haas@softwired-inc.com
  * @author <a href="mailto:stefan.bodewig@epost.de">Stefan Bodewig</a>
  */
-public class Commandline implements Cloneable {
+public class Commandline {
     private final List<Arg> arguments = new Vector<>();
 
     private final Map<String, String> envVars = Collections.synchronizedMap(new LinkedHashMap<>());
@@ -302,15 +302,6 @@ public String toString() {
         return StringUtils.join(getShellCommandline(true), " ");
     }
 
-    /**
-     * Do not call. Always throws an UnsupportedOperationException.
-     *
-     * @throws UnsupportedOperationException
-     */
-    public Object clone() {
-        throw new UnsupportedOperationException("Do we ever clone a commandline?");
-    }
-
     /**
      * Sets working directory.
      *
diff --git a/src/main/java/org/apache/maven/shared/utils/cli/shell/Shell.java b/src/main/java/org/apache/maven/shared/utils/cli/shell/Shell.java
index e991e5c7..c03d7685 100644
--- a/src/main/java/org/apache/maven/shared/utils/cli/shell/Shell.java
+++ b/src/main/java/org/apache/maven/shared/utils/cli/shell/Shell.java
@@ -36,7 +36,7 @@
  *
  * @author <a href="mailto:carlos@apache.org">Carlos Sanchez</a>
  */
-public class Shell implements Cloneable {
+public class Shell {
     private static final char[] DEFAULT_QUOTING_TRIGGER_CHARS = {' '};
 
     private String shellCommand;
@@ -331,18 +331,6 @@ String getWorkingDirectoryAsString() {
         return workingDir;
     }
 
-    /**
-     * {@inheritDoc}
-     */
-    public Object clone() {
-        throw new RuntimeException("Do we ever clone this?");
-        /*        Shell shell = new Shell();
-        shell.setExecutable( getExecutable() );
-        shell.setWorkingDirectory( getWorkingDirectory() );
-        shell.setShellArgs( getShellArgs() );
-        return shell;*/
-    }
-
     void setSingleQuotedArgumentEscaped(boolean singleQuotedArgumentEscaped) {
         this.singleQuotedArgumentEscaped = singleQuotedArgumentEscaped;
     }