URL parameter to filter report on a field with spaces

Jumping off from this example:

http://stackoverflow.com/questions/35555694/passing-parameters-to-power-bi-filter-programmatically

I can successfully get this filter URL parameter to work:

https://app.powerbi.com/groups/<group guid>/reports/<report guid>/ReportSection1?filter=Date/Date eq '31-Dec-2014'

That works fine because my table is named Date and my field is named Date.

If I try to filter on a field or a table with a space, then it fails:

?filter=My Table/My Field eq '2014'

Renaming table names and field names to remove spaces is not feasible as it breaks existing reports and makes the model less user friendly/readable. Is this truly a limitation in Power BI Service and there's no way to escape out the space?