mvn test -P using <argLine> doesn't work with a value containing @ character

Question

I am trying to set a maven profile for my unit-tests and two of all the values are containing an @ character.

-DKEY=value:@value -DKEY2=value2:n:@value2

Now everything in between the first @ and second @ is red and the mvn test -P command does not run. I have tried making the -D:s strings with "" and '' and also tried putting the values into and fetching them in my with ${name in properties} without success. Same error message but no red line is the only difference.

Help?