diff --git a/src/Init/Meta.lean b/src/Init/Meta.lean
index 96bb09674c..97e1625f27 100644
--- a/src/Init/Meta.lean
+++ b/src/Init/Meta.lean
@@ -862,7 +862,7 @@ class Quote (α : Type) (k : SyntaxNodeKind := `term) where
 
 export Quote (quote)
 
-instance [Quote α k] [CoeHTCT (TSyntax k) (TSyntax [k'])]: Quote α k' := ⟨fun a => quote (k := k) a⟩
+instance [Quote α k] [CoeHTCT (TSyntax k) (TSyntax [k'])] : Quote α k' := ⟨fun a => quote (k := k) a⟩
 
 instance : Quote Term := ⟨id⟩
 instance : Quote Bool := ⟨fun | true => mkCIdent `Bool.true | false => mkCIdent `Bool.false⟩