diff --git a/haskell-mode.el b/haskell-mode.el
index b36416820..a1925074c 100644
--- a/haskell-mode.el
+++ b/haskell-mode.el
@@ -644,7 +644,7 @@ Minor modes that work well with `haskell-mode':
   (set (make-local-variable 'paragraph-start)
        (concat " *{-\\| *-- |\\|" page-delimiter))
   (set (make-local-variable 'paragraph-separate)
-       (concat " *$\\| *-- |\\| *\\({-\\|-}\\) *$\\|" page-delimiter))
+       (concat " *$\\| *\\({-\\|-}\\) *$\\|" page-delimiter))
   (set (make-local-variable 'fill-paragraph-function) 'haskell-fill-paragraph)
   ;; (set (make-local-variable 'adaptive-fill-function) 'haskell-adaptive-fill)
   (set (make-local-variable 'adaptive-fill-mode) nil)
diff --git a/tests/haskell-mode-tests.el b/tests/haskell-mode-tests.el
index 6dba27b2b..301ed977d 100644
--- a/tests/haskell-mode-tests.el
+++ b/tests/haskell-mode-tests.el
@@ -378,8 +378,6 @@ Also should respect 10 column fill."
 	      '("-- @| a b c d")))
 
 (ert-deftest fill-comment-haddock-2 ()
-  ;; FIXME: This shouldn't be failing, https://github.com/haskell/haskell-mode/issues/851.
-  :expected-result :failed
   (check-fill '("-- | a b c"
                 "-- d e")
 	      '("-- @| a b c d"