Character "=" seems to not be supported in maven launcher parameters

In order to debug my unit tests under eclipse (without using junit debugger), I use the following maven parameter (as shown here : http://maven.apache.org/plugins/maven-surefire-plugin/examples/debugging.html) :
-Dmaven.surefire.debug="-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000 -Xnoagent -Djava.compiler=NONE"

Problem is : when I create the "maven.surefire.debug" parametre with value "-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000 -Xnoagent -Djava.compiler=NONE", then apply changes, everything goes well. I exit.

Nevertheless, when I edit this launch configuration, my value is truncated to "-Xdebug -Xrunjdwp:transport"

I tried to surround value with trailing quotes (or double quotes) but it doesn't work.

See attachment for further details.