escape character OK in R environment, fails in R CMD CHECK

Hi,
I am trying to check a package via R CMD CHECK and it is failing with

Error: '\s' is an unrecognized escape in character string starting "\s"

The culprit looks something like this:

gsub('\\s\\(.*\\)',"","this is a (test, man) dude")

which is correctly escaped with the "\\"'s ? -- but it seems that R CMD
CHECK is pre-escaping the string when it reads in the code to check it.

How do I get R CMD CHECK to let the "\\s" 's through?

Thanks.

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