diff --git a/src/Strategy/Haskell/Cabal.hs b/src/Strategy/Haskell/Cabal.hs
index d7f7ced897..eac13db88b 100644
--- a/src/Strategy/Haskell/Cabal.hs
+++ b/src/Strategy/Haskell/Cabal.hs
@@ -95,6 +95,7 @@ data InstallPlan = InstallPlan
 
 data PlanStyle
   = Local
+  | Inplace
   | Global
   deriving (Eq, Ord, Show)
 
@@ -134,6 +135,7 @@ isDirectDep InstallPlan{..} = planStyle == Just Local && planType == Configured
 parsePlanStyle :: MonadFail f => Text -> f PlanStyle
 parsePlanStyle style = case Text.toLower style of
   "global" -> pure Global
+  "inplace" -> pure Inplace
   "local" -> pure Local
   _ -> fail $ "unknown install plan style" ++ toString style