diff --git a/lib/phlex/sgml.rb b/lib/phlex/sgml.rb
index ec501fcd..3fb74572 100644
--- a/lib/phlex/sgml.rb
+++ b/lib/phlex/sgml.rb
@@ -502,6 +502,14 @@ def __nested_tokens__(tokens)
 				else
 					buffer << token.to_s
 				end
+			when Array
+				if token.length > 0
+					if i > 0
+						buffer << " " << __nested_tokens__(token)
+					else
+						buffer << __nested_tokens__(token)
+					end
+				end
 			when nil
 				# Do nothing
 			else
diff --git a/quickdraw/sgml/attributes.test.rb b/quickdraw/sgml/attributes.test.rb
index c1e3ac0d..e96040c7 100644
--- a/quickdraw/sgml/attributes.test.rb
+++ b/quickdraw/sgml/attributes.test.rb
@@ -258,6 +258,24 @@
 	) == %(<div attribute="Hello"></div>)
 end
 
+test "_, Array(String | Array)" do
+	expect(
+		phlex { div(attribute: ["hello", ["world"]]) },
+	) == %(<div attribute="hello world"></div>)
+end
+
+test "_, Array(Array | String)" do
+	expect(
+		phlex { div(attribute: [["hello"], "world"]) },
+	) == %(<div attribute="hello world"></div>)
+end
+
+test "_, Array(String | EmptyArray)" do
+	expect(
+		phlex { div(attribute: ["hello", []]) },
+	) == %(<div attribute="hello"></div>)
+end
+
 test "_, Array(*invalid*)" do
 	expect {
 		phlex { div(attribute: [Object.new]) }