diff --git a/test/Main.hs b/test/Main.hs
index 859ffd9..dbec67a 100644
--- a/test/Main.hs
+++ b/test/Main.hs
@@ -8,5 +8,10 @@ main = do
   let sandboxes = [ "test/data", "test/data/check-packageid" ]
       genSandboxCfg dir = withDirectory dir $ \cwd -> do
          system ("sed 's|@CWD@|" ++ cwd ++ "|g' cabal.sandbox.config.in > cabal.sandbox.config")
-  genSandboxCfg `mapM` sandboxes
+      pkgDirs =
+        [ "test/data/.cabal-sandbox/i386-osx-ghc-7.6.3-packages.conf.d"
+        , "test/data/check-packageid/.cabal-sandbox/i386-osx-ghc-7.6.3-packages.conf.d"]
+      genGhcPkgCache dir = system $ "ghc-pkg recache --force -f" ++ dir
+  genSandboxCfg `mapM_` sandboxes
+  genGhcPkgCache `mapM_` pkgDirs
   hspec spec