Intellij 2016.3.4 does not apply custom jvm settings on Linux

On Linux I clicked Help - Edit Custom VM options

I modified the parameters

-Xms2048m
-Xmx16000m

The file is located in /home/tmanthey/.IdeaIC2016.3/idea64.vmoptions

But when I execute you can see the parameters are not applied and I get out of memory error.

/usr/lib/jvm/java-8-oracle/bin/java -Didea.launcher.port=7532 -Didea.launcher.bin.path=/opt/intellij-idea-community/bin -Dfile.encoding=UTF-8 -classpath ........