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-rw-r--r--src/Hakyll/Core/UnixFilter.hs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/Hakyll/Core/UnixFilter.hs b/src/Hakyll/Core/UnixFilter.hs
index e6d4610..3e2d80c 100644
--- a/src/Hakyll/Core/UnixFilter.hs
+++ b/src/Hakyll/Core/UnixFilter.hs
@@ -130,6 +130,7 @@ unixFilterIO writer reader programName args input = do
-- Read from stderr
_ <- forkIO $ do
err <- hGetContents errh
+ _ <- deepseq err (return err)
hClose errh
writeIORef errRef err
putMVar lock ()