stackage-purge - ghc-pkg: cannot parse '{ghc-7.8.4}' as a package identifier

[freeman42x]

Getting this error on a fresh install of MinGHC 7.8.4 after running stackage-purge:

$ stackage-purge.exe
WARNING: there are broken packages.  Run 'ghc-pkg check' for more details.
WARNING: there are broken packages.  Run 'ghc-pkg check' for more details.
(Global) c:/Haskell/minghc-7.8.4-x86_64/ghc-7.8.4\lib\package.conf.d
Detected 16 packages to purge from this database
Unregister 16 packages (y/n)? [default: n] y
Unregistering: {ghc-7.8.4}
ghc-pkg: cannot parse '{ghc-7.8.4}' as a package identifier
stackage-purge.exe: readProcess: ghc-pkg "unregister" "{ghc-7.8.4}" "--force" "--package-db" "c:/Haskell/minghc-7.8.4-x86_64/ghc-7.8.4\\lib\\package.conf.d" (exit 1): failed