SonarQube's sonar.ProjectBaseDir Set to the first module on the list

VERSION:
Jenkins 1.573
Subversion Plugin 2.4.1
Sonar Plugin 2.1

When using multiple SVN Url's in one project, with each set to the following:

Repository URL: http://svnserver/repo/Project/module1/trunk/src
Local Module Directory: module1

Repository URL: http://svnserver/repo/Project/module2/trunk/src
Local Module Directory: module2

...

My sonar.ProjectBaseDir is being set improperly, causing builds to fail. Where the property in this case should be set to C:\Jenkins\Jobs\Project\Workspace , it is instead being set to C:\Jenkins\Jobs\Project\Workspace\module1

When trying to set the property manually with
sonar.ProjectBaseDir=$WORKSPACE
it comes out as -Dsonar.projectBaseDir=D:JenkinsjobsProjectNameworkspace (No slashes)

Any attempts to backreference sonar properties to the workspace parent folder have proven unsuccessful