diff --git a/lib/debug/config.rb b/lib/debug/config.rb
index eb132ce4a..86b9bfdc9 100644
--- a/lib/debug/config.rb
+++ b/lib/debug/config.rb
@@ -163,11 +163,7 @@ def update conf
         if defined?(SESSION) && SESSION.active?
           # irb_console is switched from true to false
           if old
-            Reline.completion_proc = nil
-            Reline.output_modifier_proc = nil
-            Reline.autocompletion = false
-            Reline.dig_perfect_match_proc = nil
-            SESSION.reset_ui UI_LocalConsole.new
+            SESSION.deactivate_irb_integration
           # irb_console is switched from false to true
           else
             if CONFIG[:open]
diff --git a/lib/debug/irb_integration.rb b/lib/debug/irb_integration.rb
index a2ea34b65..3fc92ea61 100644
--- a/lib/debug/irb_integration.rb
+++ b/lib/debug/irb_integration.rb
@@ -24,4 +24,14 @@ def activate_irb_integration
       IRB::Context.prepend(IrbPatch)
     end
   end
+
+  class Session
+    def deactivate_irb_integration
+      Reline.completion_proc = nil
+      Reline.output_modifier_proc = nil
+      Reline.autocompletion = false
+      Reline.dig_perfect_match_proc = nil
+      reset_ui UI_LocalConsole.new
+    end
+  end
 end