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diff --git a/html-test/src/Threaded_TH.hs b/html-test/src/Threaded_TH.hs
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+-- | Imported by 'Threaded', since a TH splice can't be used in the
+-- module where it is defined.
+module Threaded_TH where
+
+import Control.Concurrent (forkOS)
+import Language.Haskell.TH.Syntax (Exp (LitE), Lit (IntegerL), Q, runIO)
+
+-- | forkOS requires the threaded RTS, so this TH fails if haddock was
+-- built without @-threaded@.
+forkTH :: Q Exp
+forkTH = do
+  _ <- runIO (forkOS (return ()))
+  return (LitE (IntegerL 0))