diff --git a/lib/thor/parser/option.rb b/lib/thor/parser/option.rb
index f53d6d70..b1a99431 100644
--- a/lib/thor/parser/option.rb
+++ b/lib/thor/parser/option.rb
@@ -104,6 +104,15 @@ def aliases_for_usage
       end
     end
 
+    def show_default?
+      case default
+      when TrueClass, FalseClass
+        true
+      else
+        super
+      end
+    end
+
     VALID_TYPES.each do |type|
       class_eval <<-RUBY, __FILE__, __LINE__ + 1
         def #{type}?
diff --git a/spec/parser/option_spec.rb b/spec/parser/option_spec.rb
index 1b93f132..54aba1bb 100644
--- a/spec/parser/option_spec.rb
+++ b/spec/parser/option_spec.rb
@@ -269,4 +269,21 @@ def option(name, options = {})
       end
     end
   end
+
+  describe "#print_default" do
+    it "prints boolean with true default value" do
+      expect(option(:foo, {
+        required: false,
+        type: :boolean,
+        default: true
+      }).print_default).to eq(true)
+    end
+    it "prints boolean with false default value" do
+      expect(option(:foo, {
+        required: false,
+        type: :boolean,
+        default: false
+      }).print_default).to eq(false)
+    end
+  end
 end