diff --git a/extensions/lisp-mode/lisp-mode.lisp b/extensions/lisp-mode/lisp-mode.lisp
index bc8e5c34c..fdc1926c3 100644
--- a/extensions/lisp-mode/lisp-mode.lisp
+++ b/extensions/lisp-mode/lisp-mode.lisp
@@ -236,11 +236,6 @@
       (connect-to-micros *localhost* port)
       (update-buffer-package)
 
-      ;; XXX:
-      ;; Systems added after lem initialization are not visible from within this process and must
-      ;; be re-initialized.
-      (asdf:clear-source-registry)
-
       (setf *self-connected-port* port))))
 
 (defun self-connection ()
diff --git a/src/lem.lisp b/src/lem.lisp
index c40b75eb2..8512f0b80 100644
--- a/src/lem.lisp
+++ b/src/lem.lisp
@@ -47,20 +47,12 @@
       (unless (uiop:pathname-equal current-dir (user-homedir-pathname))
         (maybe-load (merge-pathnames ".lemrc" current-dir))))))
 
-(defun initialize-source-registry ()
-  (asdf:initialize-source-registry
-   `(:source-registry
-     :inherit-configuration
-     (:also-exclude ".qlot")
-     (:tree ,(asdf:system-source-directory :lem)))))
-
 (defun init-at-build-time ()
   "This function is called when an lem executable file is built.
 If a file named $HOME/.lem/build-init.lisp exists, it is loaded.
 The difference is that init.lisp loading is called when the editor is started,
 while build-init.lisp is called when the binary file is created.
 See scripts/build-ncurses.lisp or scripts/build-sdl2.lisp"
-  (initialize-source-registry)
   (let ((file (merge-pathnames "build-init.lisp" (lem-home))))
     (when (uiop:file-exists-p file)
       (load file))))