 
       compilationDefer.promise.then(
         -> q.all([
-          q.nfcall fs.readFile, "./tests/results/single/source.css"
-          q.nfcall fs.readFile, "./tests/results/single/source.css.map"
+          q.nfcall fs.readFile, "./tests/results/single/source.css", "utf-8"
+          q.nfcall(
+            fs.readFile,
+            "./tests/results/single/source.css.map",
+            "utf-8"
+          )
         ]).then(
           (data) ->
             expect(

          promises = []
          promises.push q.nfcall(
            fs.readFile,
            "./tests/results/imports/main.css"
          ).then(
            (data) -> expect(
              removeMapFile(data.toString "utf-8").trim()

            )
            promises.push q.nfcall(
              fs.readFile,
              resultPath + ".map",
              "utf-8"
            ).then(
              (map) ->
                sourcemap = JSON.parse map
