diff --git a/src/DiffSummary.hs b/src/DiffSummary.hs
index f7652f98a..22861dea9 100644
--- a/src/DiffSummary.hs
+++ b/src/DiffSummary.hs
@@ -244,7 +244,6 @@ toTermName source term = case unwrap term of
     Just expr -> termNameFromSource expr
     Nothing -> fromMaybe "branch" $ (toCategoryName . category) . extract <$> head children
   S.Rescue args _ -> intercalate ", " $ toTermName' <$> args
-  S.Params args -> mconcat $ toTermName' <$> args
   where toTermName' = toTermName source
         termNameFromChildren term children = termNameFromRange (unionRangesFrom (range term) (range <$> children))
         termNameFromSource term = termNameFromRange (range term)
diff --git a/src/Language/Ruby.hs b/src/Language/Ruby.hs
index ee397346b..533fcc642 100644
--- a/src/Language/Ruby.hs
+++ b/src/Language/Ruby.hs
@@ -43,7 +43,6 @@ termConstructor source sourceSpan name range children
     ("conditional_assignment", _ ) -> S.Error children
     ("conditional", condition : cases) -> S.Ternary condition cases
     ("conditional", _ ) -> S.Error children
-    ("formal_parameters", _) -> S.Params children
     ("function_call", _) -> case runCofree <$> children of
       [ _ :< S.MemberAccess{..}, _ :< S.Args args ] -> S.MethodCall memberId property args
       [ _ :< S.MemberAccess{..} ] -> S.MethodCall memberId property []
@@ -63,11 +62,9 @@ termConstructor source sourceSpan name range children
     ("math_assignment", _ ) -> S.Error children
     ("member_access", [ base, property ]) -> S.MemberAccess base property
     ("member_access", _ ) -> S.Error children
-    ("method_declaration", _) -> case runCofree <$> children of
-      [ identifier, params@(_ :< S.Params _) ] -> S.Method (cofree identifier) (toList params) []
-      [ identifier ] -> S.Method (cofree identifier) [] []
-      ( identifier : params@(_ :< S.Params _ ) : exprs) -> S.Method (cofree identifier) (toList params) (cofree <$> exprs)
-      ( identifier : exprs ) -> S.Method (cofree identifier) [] (cofree <$> exprs)
+    ("method_declaration", _) -> case children of
+      identifier : params : body | category (extract params) == Params -> S.Method identifier (toList (unwrap params)) body
+      identifier : body -> S.Method identifier [] body
       _ -> S.Error children
     ("module_declaration", identifier : body ) -> S.Module identifier body
     ("module_declaration", _ ) -> S.Error children
diff --git a/src/Renderer/JSON.hs b/src/Renderer/JSON.hs
index bd3b5fe71..60c675efa 100644
--- a/src/Renderer/JSON.hs
+++ b/src/Renderer/JSON.hs
@@ -132,5 +132,4 @@ syntaxToTermField syntax = case syntax of
   S.Unless expr clauses -> [ "unless" .= expr ] <> childrenFields clauses
   S.BlockExpression condition expressions -> [ "condition" .= condition ] <> childrenFields expressions
   S.Rescue args expressions -> [ "args" .= args ] <> childrenFields expressions
-  S.Params c -> childrenFields c
   where childrenFields c = [ "children" .= c ]
diff --git a/src/Syntax.hs b/src/Syntax.hs
index 92109c506..a9279aa4a 100644
--- a/src/Syntax.hs
+++ b/src/Syntax.hs
@@ -88,8 +88,6 @@ data Syntax a f
   | BlockExpression (Maybe f) [f]
   -- | A rescue block has a list of arguments to rescue and a list of expressions.
   | Rescue [f] [f]
-  -- | Parameters in a method/function definition
-  | Params [f]
   deriving (Eq, Foldable, Functor, Generic, Generic1, Mergeable, Ord, Show, Traversable, ToJSON)