[M2] setting encoding in compiler plugin

[Roberto UserList <rc...@gmail.com>]

Hi all!
I've been trying to set the encoding in Maven compiler plugin, but, it seems
not to recognize my configuration.
I've tried many xml configuration, but, I think all of them are incorrect.
Check it out!
<plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>2.0</version>
        <configuration>
               <source>1.5</source>
               <target>1.5</target>
               <compilerArgument>-encoding ISO-8859-1</compilerArgument>
       </configuration>
</plugin>

I've tried configuring the encoding in a isolated tag, like this:
<encoding>ISO-8859-1</encoding>
But none of the configuration seems to work correctly.
Can anyone tell me the correct sintax?
Thanks in advance for the help.
Regards,
Roberto.