diff --git a/lib/irb/command/base.rb b/lib/irb/command/base.rb
index ff74b5fb35..b078b48237 100644
--- a/lib/irb/command/base.rb
+++ b/lib/irb/command/base.rb
@@ -50,25 +50,6 @@ module IRB
 
       attr_reader :irb_context
 
-      def unwrap_string_literal(str)
-        return if str.empty?
-
-        sexp = Ripper.sexp(str)
-        if sexp && sexp.size == 2 && sexp.last&.first&.first == :string_literal
-          @irb_context.workspace.binding.eval(str).to_s
-        else
-          str
-        end
-      end
-
-      def ruby_args(arg)
-        # Use throw and catch to handle arg that includes `;`
-        # For example: "1, kw: (2; 3); 4" will be parsed to [[1], { kw: 3 }]
-        catch(:EXTRACT_RUBY_ARGS) do
-          @irb_context.workspace.binding.eval "IRB::Command.extract_ruby_args #{arg}"
-        end || [[], {}]
-      end
-
       def execute(arg)
         #nop
       end
diff --git a/lib/irb/command/edit.rb b/lib/irb/command/edit.rb
index 3c4a54e5e2..cb7e0c4873 100644
--- a/lib/irb/command/edit.rb
+++ b/lib/irb/command/edit.rb
@@ -8,6 +8,8 @@ module IRB
 
   module Command
     class Edit < Base
+      include RubyArgsExtractor
+
       category "Misc"
       description 'Open a file or source location.'
       help_message <<~HELP_MESSAGE
diff --git a/lib/irb/command/internal_helpers.rb b/lib/irb/command/internal_helpers.rb
new file mode 100644
index 0000000000..249b5cdede
--- /dev/null
+++ b/lib/irb/command/internal_helpers.rb
@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+module IRB
+  module Command
+    # Internal use only, for default command's backward compatibility.
+    module RubyArgsExtractor # :nodoc:
+      def unwrap_string_literal(str)
+        return if str.empty?
+
+        sexp = Ripper.sexp(str)
+        if sexp && sexp.size == 2 && sexp.last&.first&.first == :string_literal
+          @irb_context.workspace.binding.eval(str).to_s
+        else
+          str
+        end
+      end
+
+      def ruby_args(arg)
+        # Use throw and catch to handle arg that includes `;`
+        # For example: "1, kw: (2; 3); 4" will be parsed to [[1], { kw: 3 }]
+        catch(:EXTRACT_RUBY_ARGS) do
+          @irb_context.workspace.binding.eval "IRB::Command.extract_ruby_args #{arg}"
+        end || [[], {}]
+      end
+    end
+  end
+end
diff --git a/lib/irb/command/load.rb b/lib/irb/command/load.rb
index 33e327f4a9..1cd3f279d1 100644
--- a/lib/irb/command/load.rb
+++ b/lib/irb/command/load.rb
@@ -10,6 +10,7 @@ module IRB
 
   module Command
     class LoaderCommand < Base
+      include RubyArgsExtractor
       include IrbLoader
 
       def raise_cmd_argument_error
diff --git a/lib/irb/command/ls.rb b/lib/irb/command/ls.rb
index f6b1964864..cbd9998bc4 100644
--- a/lib/irb/command/ls.rb
+++ b/lib/irb/command/ls.rb
@@ -11,6 +11,8 @@ module IRB
 
   module Command
     class Ls < Base
+      include RubyArgsExtractor
+
       category "Context"
       description "Show methods, constants, and variables."
 
diff --git a/lib/irb/command/measure.rb b/lib/irb/command/measure.rb
index 70dc69cdec..f96be20de8 100644
--- a/lib/irb/command/measure.rb
+++ b/lib/irb/command/measure.rb
@@ -3,6 +3,8 @@ module IRB
 
   module Command
     class Measure < Base
+      include RubyArgsExtractor
+
       category "Misc"
       description "`measure` enables the mode to measure processing time. `measure :off` disables it."
 
diff --git a/lib/irb/command/show_doc.rb b/lib/irb/command/show_doc.rb
index f9393cd3b5..8a2188e4eb 100644
--- a/lib/irb/command/show_doc.rb
+++ b/lib/irb/command/show_doc.rb
@@ -3,6 +3,8 @@
 module IRB
   module Command
     class ShowDoc < Base
+      include RubyArgsExtractor
+
       category "Context"
       description "Look up documentation with RI."
 
diff --git a/lib/irb/command/show_source.rb b/lib/irb/command/show_source.rb
index c4c8fc0041..f4c6f104a2 100644
--- a/lib/irb/command/show_source.rb
+++ b/lib/irb/command/show_source.rb
@@ -7,6 +7,8 @@ require_relative "../color"
 module IRB
   module Command
     class ShowSource < Base
+      include RubyArgsExtractor
+
       category "Context"
       description "Show the source code of a given method, class/module, or constant."
 
diff --git a/lib/irb/command/subirb.rb b/lib/irb/command/subirb.rb
index 24428a5c13..138d61c930 100644
--- a/lib/irb/command/subirb.rb
+++ b/lib/irb/command/subirb.rb
@@ -9,6 +9,8 @@ module IRB
 
   module Command
     class MultiIRBCommand < Base
+      include RubyArgsExtractor
+
       private
 
       def print_deprecated_warning
diff --git a/lib/irb/default_commands.rb b/lib/irb/default_commands.rb
index 6025b0547d..d680655fee 100644
--- a/lib/irb/default_commands.rb
+++ b/lib/irb/default_commands.rb
@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require_relative "command"
+require_relative "command/internal_helpers"
 require_relative "command/context"
 require_relative "command/exit"
 require_relative "command/force_exit"