diff --git a/asdf.asd b/asdf.asd
index d1d64de2320db1054abb603101ef6e6898b74713..40dbce762beb1269bf94334cbf9cc321fd2caf90 100644
--- a/asdf.asd
+++ b/asdf.asd
@@ -14,7 +14,7 @@
   :licence "MIT"
   :description "Another System Definition Facility"
   :long-description "ASDF builds Common Lisp software organized into defined systems."
-  :version "2.21.3" ;; to be automatically updated by bin/bump-revision
+  :version "2.21.4" ;; to be automatically updated by bin/bump-revision
   :depends-on ()
   :components
   ((:file "asdf")
diff --git a/asdf.lisp b/asdf.lisp
index b58362c47bfe7a74f9e4badcab85ef2df619c2aa..f97795e85c050314b6a731bb6e125dac336ebe83 100644
--- a/asdf.lisp
+++ b/asdf.lisp
@@ -1,5 +1,5 @@
 ;;; -*- mode: Common-Lisp; Base: 10 ; Syntax: ANSI-Common-Lisp ; coding: utf-8 -*-
-;;; This is ASDF 2.21.3: Another System Definition Facility.
+;;; This is ASDF 2.21.4: Another System Definition Facility.
 ;;;
 ;;; Feedback, bug reports, and patches are all welcome:
 ;;; please mail to <asdf-devel@common-lisp.net>.
@@ -116,7 +116,7 @@
          ;; "2.345.6" would be a development version in the official upstream
          ;; "2.345.0.7" would be your seventh local modification of official release 2.345
          ;; "2.345.6.7" would be your seventh local modification of development version 2.345.6
-         (asdf-version "2.21.3")
+         (asdf-version "2.21.4")
          (existing-asdf (find-class 'component nil))
          (existing-version *asdf-version*)
          (already-there (equal asdf-version existing-version)))
@@ -2791,7 +2791,7 @@ details."
 (defun* find-class* (x &optional (errorp t) environment)
   (etypecase x
     ((or standard-class built-in-class) x)
-    (symbol (find-class x errorp) environment)))
+    (symbol (find-class x errorp environment))))
 
 (defun* class-for-type (parent type)
   (or (loop :for symbol :in (list