diff --git a/lib/phlex/html.rb b/lib/phlex/html.rb
index afe24b88..bb6e00b5 100644
--- a/lib/phlex/html.rb
+++ b/lib/phlex/html.rb
@@ -354,7 +354,14 @@ def capture(&block)
 				when Symbol
 					buffer << " " << name << '="' << ERB::Util.html_escape(v.name) << '"'
 				when Hash
-					_build_attributes(v.transform_keys { "#{k}-#{_1.name.tr('_', '-')}" }, buffer: buffer)
+					_build_attributes(
+						v.transform_keys { |subkey|
+							case subkey
+								when Symbol then"#{k}-#{subkey.name.tr('_', '-')}"
+								else "#{k}-#{subkey}"
+							end
+						}, buffer: buffer
+					)
 				else
 					buffer << " " << name << '="' << ERB::Util.html_escape(v.to_s) << '"'
 				end
diff --git a/test/phlex/view/attributes.rb b/test/phlex/view/attributes.rb
index 37951569..e9cb04af 100644
--- a/test/phlex/view/attributes.rb
+++ b/test/phlex/view/attributes.rb
@@ -15,6 +15,18 @@ def template
 		end
 	end
 
+	with "string keyed hash attributes" do
+		view do
+			def template
+				div data: { "name_first_name" => "Joel" }
+			end
+		end
+
+		it "flattens the attributes without dasherizing them" do
+			expect(output).to be == %(<div data-name_first_name="Joel"></div>)
+		end
+	end
+
 	if RUBY_ENGINE == "ruby"
 		with "unique tag attributes" do
 			view do