diff --git a/modules/lang/common-lisp/config.el b/modules/lang/common-lisp/config.el
index 943bcb001..c844bc6e1 100644
--- a/modules/lang/common-lisp/config.el
+++ b/modules/lang/common-lisp/config.el
@@ -7,10 +7,12 @@
 
   (set-popup-rules!
     '(("^\\*sly-mrepl"       :vslot 2 :quit nil :ttl nil)
-      ("^\\*sly-db"          :vslot 3 :quit nil :ttl nil)
-      ("^\\*sly-compilation" :vslot 4 :ttl nil)
-      ("^\\*sly-inspector"   :vslot 5 :ttl nil)
-      ("^\\*sly-traces"      :vslot 6 :ttl nil)))
+      ("^\\*sly-compilation" :vslot 3 :ttl nil)
+      ("^\\*sly-traces"      :vslot 4 :ttl nil)))
+
+  ;; Do not display debugger or inspector buffers in a popup window.
+  ;; These buffers are meant to be displayed with sufficient vertical space.
+  (set-popup-rule! "^\\*sly-\\(db\\|inspector\\)" :ignore t)
 
   (set-repl-handler! 'lisp-mode #'sly-mrepl)
   (set-eval-handler! 'lisp-mode #'sly-eval-region)