--- a/hdf5.cabal
+++ b/hdf5.cabal
@@ -134,4 +134,4 @@ test-suite hdf5-test
   other-modules:       Spec.Util
                      , Spec.File
                      , Spec.Group
-  ghc-options:         -Wall -threaded -rtsopts -with-rtsopts=-N
+  ghc-options:         -Wall -threaded -rtsopts
