diff --git a/source/library/Language/Haskell/Brittany/Internal/Types.hs b/source/library/Language/Haskell/Brittany/Internal/Types.hs
index c6b7765..7ee6ecd 100644
--- a/source/library/Language/Haskell/Brittany/Internal/Types.hs
+++ b/source/library/Language/Haskell/Brittany/Internal/Types.hs
@@ -170,22 +170,34 @@ newtype CommentCounter = CommentCounter { unCommentCounter :: Int }
 -- to remember to call `docFlushRemaining` in combination with this!
 briDocMToPPM :: ToBriDocM a -> PPMLocal (a, Int)
 briDocMToPPM m = do
-  readers <- MultiRWSS.mGetRawR
+  readers   <- MultiRWSS.mGetRawR
   initCount <- MultiRWSS.mGet @CommentCounter
-  let
-    (((x, errs), debugs), commentCount) =
-      runIdentity
-        $ MultiRWSS.runMultiRWSTNil
-        $ MultiRWSS.withMultiStateAS initCount
-        $ MultiRWSS.withMultiStateA (NodeAllocIndex 1)
-        $ MultiRWSS.withMultiReaders readers
-        $ MultiRWSS.withMultiWriterAW
-        $ MultiRWSS.withMultiWriterAW
-        $ m
+  let (((x, errs), debugs), commentCount) =
+        runIdentity
+          $ MultiRWSS.runMultiRWSTNil
+          $ MultiRWSS.withMultiStateAS initCount
+          $ MultiRWSS.withMultiStateA (NodeAllocIndex 1)
+          $ MultiRWSS.withMultiReaders readers
+          $ MultiRWSS.withMultiWriterAW
+          $ MultiRWSS.withMultiWriterAW
+          $ m
   mTell debugs
   mTell errs
   mSet commentCount
-  pure (x, length errs)
+  pure
+    ( x
+    , sum
+        [ case e of
+            ErrorInput{}          -> 1
+            ErrorUnusedComment{}  -> 1
+            ErrorUnusedComments{} -> 1
+            ErrorMacroConfig{}    -> 0
+            LayoutWarning{}       -> 0
+            ErrorUnknownNode{}    -> 1
+            ErrorOutputCheck{}    -> 0
+        | e <- errs
+        ]
+    )