diff --git a/data/15-regressions.blt b/data/15-regressions.blt
index 4c43e3d..ae922ff 100644
--- a/data/15-regressions.blt
+++ b/data/15-regressions.blt
@@ -1043,3 +1043,11 @@ duGswidunBlxaq drux = DeeX.Vufcqqafi
     | otherwise
     -> Likiotq
   )
+
+#test multiline-block-comment in do-block
+func = do
+  abc
+  {- some long
+     block comment -}
+  x <- readLine
+  print x
diff --git a/source/library/Language/Haskell/Brittany/Internal/WriteBriDoc/Operators.hs b/source/library/Language/Haskell/Brittany/Internal/WriteBriDoc/Operators.hs
index d61a306..354d4d6 100644
--- a/source/library/Language/Haskell/Brittany/Internal/WriteBriDoc/Operators.hs
+++ b/source/library/Language/Haskell/Brittany/Internal/WriteBriDoc/Operators.hs
@@ -25,6 +25,7 @@ where
 
 import Language.Haskell.Brittany.Internal.Prelude
 
+import qualified Data.Maybe
 import qualified Data.Text                     as Text
 import qualified Data.Text.Lazy.Builder        as Text.Builder
 import qualified GHC.OldList                   as List
@@ -157,7 +158,9 @@ layoutWriteComment absolute isBlock dp commentLines s = do -- TODO92 we don't mo
         PlannedNewline l ->
           if l <= y then PlannedSameline 1 else PlannedNewline (l - y)
         PlannedDelta l i ->
-          if l <= y then PlannedSameline 1 else PlannedDelta (l - y) i
+          if l <= y && Data.Maybe.isNothing (_lstate_markerForDelta state)
+            then PlannedSameline 1
+            else PlannedDelta (l - y) i
       else case _lstate_plannedSpace state of
         PlannedNone        -> PlannedDelta 1 (_lstate_curY state)
         PlannedSameline i  -> PlannedDelta 1 (_lstate_curY state + i)