diff --git a/collects/stepper/private/macro-unwind.rkt b/collects/stepper/private/macro-unwind.rkt
index f17deb1920..3c6cdc30d6 100644
--- a/collects/stepper/private/macro-unwind.rkt
+++ b/collects/stepper/private/macro-unwind.rkt
@@ -59,6 +59,7 @@
     [(#%plain-app f arg)
      (let ([fn (syntax->datum #'f)])
        (or (eq? fn 'lazy-proc)
+           (eq? fn 'make-lazy-proc)
            (eq? fn 'force) (eq? fn '!) (eq? fn '!!)
            (eq? fn '!list) (eq? fn '!!list)
            (equal? fn '(#%plain-app parameter-procedure))))