diff --git a/src/Lean/PrettyPrinter/Delaborator/Builtins.lean b/src/Lean/PrettyPrinter/Delaborator/Builtins.lean
index e79b854a1e..9aa5494ed5 100644
--- a/src/Lean/PrettyPrinter/Delaborator/Builtins.lean
+++ b/src/Lean/PrettyPrinter/Delaborator/Builtins.lean
@@ -452,7 +452,7 @@ def delabStructureInstance : Delab := whenPPOption getPPStructureInstances do
       -- index 2 is unused.
       pure <| some (← descend ty 2 delab)
     else pure <| none
-  `({ $[$fields, ]* $lastField $[: $ty]? })
+  `(FIXME) -- `({ $[$fields, ]* $lastField $[: $ty]? })
 
 @[builtinDelab app.Prod.mk]
 def delabTuple : Delab := whenPPOption getPPNotation do