diff --git a/asdf.asd b/asdf.asd
index 4f4b107c50e7fb418972effa0ba742ae5b42dc51..d10501f73a0c152615bb0ff20ea96927e47a17f3 100644
--- a/asdf.asd
+++ b/asdf.asd
@@ -15,14 +15,18 @@
   :licence "MIT"
   :description "Another System Definition Facility"
   :long-description "ASDF builds Common Lisp software organized into defined systems."
-  :version "2.26.78" ;; to be automatically updated by bin/bump-revision
+  :version "2.26.79" ;; to be automatically updated by bin/bump-revision
   :depends-on ()
-  :components ((:module "build" :components ((:file "asdf")))))
+  :components ((:module "build" :components ((:file "asdf"))))
+  :in-order-to (#+asdf2.27 (compile-op (monolithic-load-concatenated-source-op generate-asdf))))
 
+#-asdf2.27
 (defmethod perform :before
     ((o compile-op)
      (c (eql (first (module-components
                      (first (module-components (find-system :asdf))))))))
-  (declare (ignorable o c))
-  #-asdf2.27 (perform (make-instance 'load-source-op) c)
-  #+asdf2.27 (perform (make-instance 'monolithic-load-concatenated-source-op) (find-system 'generate-asdf)))
+  (declare (ignorable o))
+  (perform (make-instance 'load-source-op) c))
+
+#+(and clisp (not asdf2.27))
+(rename-package :asdf :asdf-utilities)
diff --git a/header.lisp b/header.lisp
index cd7618dd59dc854247587857eace8a02e18747fe..5cbdd4e8f4060802c22cbc43bb525d188d30d8e5 100644
--- a/header.lisp
+++ b/header.lisp
@@ -1,5 +1,5 @@
 ;; -*- mode: Common-Lisp; Base: 10 ; Syntax: ANSI-Common-Lisp ; coding: utf-8 -*-
-;;; This is ASDF 2.26.78: Another System Definition Facility.
+;;; This is ASDF 2.26.79: Another System Definition Facility.
 ;;;
 ;;; Feedback, bug reports, and patches are all welcome:
 ;;; please mail to <asdf-devel@common-lisp.net>.
diff --git a/interface.lisp b/interface.lisp
index 6d996be56032dc5f175076c7b170c7b2904e8dcc..cec7dd77d587869e1822aed26f182b86feb27bf3 100644
--- a/interface.lisp
+++ b/interface.lisp
@@ -2,7 +2,7 @@
 ;;;; Handle ASDF package upgrade, including implementation-dependent magic.
 
 (asdf/package:define-package :asdf/interface
-  (:nicknames :asdf)
+  (:nicknames :asdf :asdf-utilities)
   (:recycle :asdf/interface :asdf)
   (:unintern
    #:*asdf-revision* #:around #:asdf-method-combination #:intern*
diff --git a/operate.lisp b/operate.lisp
index 99a91f7b47e3e9d9257874a00b577560e20d5742..a96f6250f75780d3bc25e61b7ca75face01c32c4 100644
--- a/operate.lisp
+++ b/operate.lisp
@@ -3,7 +3,7 @@
 
 (asdf/package:define-package :asdf/operate
   (:recycle :asdf/operate :asdf)
-  (:use :common-lisp :asdf/utility :asdf/upgrade
+  (:use :common-lisp :asdf/package :asdf/utility :asdf/upgrade
         :asdf/component :asdf/system :asdf/operation :asdf/action
         :asdf/lisp-build :asdf/lisp-action #:asdf/plan
         :asdf/find-system :asdf/find-component)
@@ -17,12 +17,12 @@
 
 (defgeneric* operate (operation-class system &key &allow-other-keys))
 
-(defun* cleanup-upgraded-asdf ()
-  (let ((asdf (funcall (find-symbol* 'find-system :asdf) :asdf)))
+(defun* reset-asdf-systems ()
+  (let ((asdf (symbol-call :asdf 'find-system :asdf)))
     ;; Invalidate all systems but ASDF itself.
     (setf *defined-systems* (make-defined-systems-table))
     (register-system asdf)
-    (funcall (find-symbol* 'load-system :asdf) :asdf))) ;; load ASDF a second time, the right way.
+    (symbol-call :asdf 'load-system :asdf))) ;; load ASDF a second time, the right way.
 
 (defun* restart-upgraded-asdf ()
   ;; If we're in the middle of something, restart it.
@@ -31,7 +31,7 @@
       (clrhash *systems-being-defined*)
       (dolist (s l) (find-system s nil)))))
 
-(pushnew 'cleanup-upgraded-asdf *post-upgrade-cleanup-hook*)
+(pushnew 'reset-asdf-systems *post-upgrade-cleanup-hook*)
 (pushnew 'restart-upgraded-asdf *post-upgrade-restart-hook*)
 
 
diff --git a/package.lisp b/package.lisp
index b03135547fcac4b55b80362a1e6f978f1a7be899..e80277cc279b923821e60a762d05417c51fb19cc 100644
--- a/package.lisp
+++ b/package.lisp
@@ -442,5 +442,6 @@ or when loading the package is optional."
 
 #+clisp
 (eval-when (:compile-toplevel :load-toplevel :execute)
-  (when (find-package :asdf) (delete-package* :asdf)))
+  (when (and (find-package :asdf) (not (member :asdf2.27 *features*)))
+    (delete-package* :asdf)))
 
diff --git a/test/run-tests.sh b/test/run-tests.sh
index 11dab69cae37e81bf840131a988375094ebeffb4..81d9a440d751df3c3ac7a4c6c75f892d9bf90b13 100755
--- a/test/run-tests.sh
+++ b/test/run-tests.sh
@@ -167,7 +167,7 @@ case "$lisp" in
     eval="-eval" ;;
   sbcl)
     command="${SBCL:-sbcl}"
-    flags="--noinform --userinit /dev/null --sysinit /dev/null"
+    flags="--noinform --userinit /dev/null --sysinit /dev/null" # --eval (require'asdf)
     nodebug="--disable-debugger"
     eval="--eval" ;;
   scl)
diff --git a/upgrade.lisp b/upgrade.lisp
index 87d411bec40b0ca7e0a0377abab9a97f05e3c8ed..78511acb1077d2b44954857927f5666591109ef2 100644
--- a/upgrade.lisp
+++ b/upgrade.lisp
@@ -7,7 +7,7 @@
   (:use :common-lisp :asdf/package :asdf/compatibility :asdf/utility)
   (:export
    #:upgrade-asdf #:asdf-upgrade-error #:when-upgrade
-   #:*post-upgrade-cleanup-hook* #:*post-upgrade-restart-hook*
+   #:*post-upgrade-cleanup-hook* #:*post-upgrade-restart-hook* #:cleanup-upgraded-asdf
    #:asdf-version #:*upgraded-p*
    #:asdf-message #:*asdf-verbose* #:*verbose-out*))
 (in-package :asdf/upgrade)
@@ -21,7 +21,7 @@
   (defvar *verbose-out* nil)
   (defun asdf-message (format-string &rest format-args)
     (apply 'format *verbose-out* format-string format-args)))
-  
+
 (eval-when (:load-toplevel :compile-toplevel :execute)
   (let* (;; For bug reporting sanity, please always bump this version when you modify this file.
          ;; Please also modify asdf.asd to reflect this change. The script bin/bump-version
@@ -31,7 +31,7 @@
          ;; "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 "2.26.78")
+         (asdf-version "2.26.79")
          (existing-asdf (find-class (find-symbol* :component :asdf nil) nil))
          (existing-version *asdf-version*)
          (already-there (equal asdf-version existing-version)))
@@ -70,7 +70,7 @@ You can compare this string with e.g.:
 (defvar *post-upgrade-cleanup-hook* ())
 (defvar *post-upgrade-restart-hook* ())
 
-(defun* post-upgrade-cleanup (old-version)
+(defun* cleanup-upgraded-asdf (old-version)
   (let ((new-version (asdf-version)))
     (unless (equal old-version new-version)
       (cond
@@ -94,6 +94,6 @@ You can compare this string with e.g.:
    We need do that before we operate on anything that depends on ASDF."
   (let ((version (asdf-version)))
     (handler-bind (((or style-warning warning) #'muffle-warning))
-      (funcall (find-symbol* 'load-system :asdf) :asdf :verbose nil))
-    (post-upgrade-cleanup version)))
+      (symbol-call :asdf :load-system :asdf :verbose nil))
+    (cleanup-upgraded-asdf version)))