diff --git a/racket/src/racket/src/resolve.c b/racket/src/racket/src/resolve.c
index 95c0f60f01..4e56ca457d 100644
--- a/racket/src/racket/src/resolve.c
+++ b/racket/src/racket/src/resolve.c
@@ -1638,7 +1638,6 @@ resolve_lambda(Scheme_Object *_lam, Resolve_Info *info,
   }
 
   /* Check possibility of unboxing arguments: */
-  closure_size = lam->closure_size;
   if (cl->arg_types) {
     int at_least_one = 0;
     for (i = lam->num_params; i--; ) {