diff --git a/src/Parsing/Parser.hs b/src/Parsing/Parser.hs
index 885a54568..c79c33926 100644
--- a/src/Parsing/Parser.hs
+++ b/src/Parsing/Parser.hs
@@ -154,7 +154,7 @@ markdownParser = AssignmentParser MarkdownParser Markdown.assignment
 
 -- | A parser for producing specialized (tree-sitter) ASTs.
 data SomeASTParser where
-  SomeASTParser :: forall grammar. (Bounded grammar, Enum grammar, Show grammar)
+  SomeASTParser :: (Bounded grammar, Enum grammar, Show grammar)
                 => Parser (AST [] grammar)
                 -> SomeASTParser