diff --git a/tests/IO/hSetBuffering004.hs b/tests/IO/hSetBuffering004.hs
index eaee6826..01b9aaed 100644
--- a/tests/IO/hSetBuffering004.hs
+++ b/tests/IO/hSetBuffering004.hs
@@ -7,3 +7,4 @@ main :: IO ()
 main = do hSetBuffering stdin NoBuffering
           hLookAhead stdin >>= print
           hSetBuffering stdin LineBuffering
+          getContents >>= print
diff --git a/tests/IO/hSetBuffering004.stdout b/tests/IO/hSetBuffering004.stdout
index 7766eec9..a7c39464 100644
--- a/tests/IO/hSetBuffering004.stdout
+++ b/tests/IO/hSetBuffering004.stdout
@@ -1 +1,2 @@
 '-'
+"-- test for #2678\nmodule Main (main) where\n\nimport System.IO\n\nmain :: IO ()\nmain = do hSetBuffering stdin NoBuffering\n          hLookAhead stdin >>= print\n          hSetBuffering stdin LineBuffering\n          getContents >>= print\n"