diff --git a/exe/vaporware b/exe/vaporware
index e2d639b..821c288 100755
--- a/exe/vaporware
+++ b/exe/vaporware
@@ -5,11 +5,12 @@ require "optparse"
 opt = OptionParser.new
 options = {}
 opt.on("-c", "--compiler[=VAL]", "this option is selecting compiler precompiled file, default: \"self\"") { |v| options[:compiler] = v }
+opt.on("-a", "--assembler[=VAL]", "this option is selecting assembler assembler file, default: \"as\"") { |v| options[:assembler] = v }
 opt.on("-D", "--debug") { |v| options[:debug] = v }
 opt.on("-o", "--objects[=VAL]") { |v| options[:dest] = v }
 opt.on("--compiler-options[=VAL]", "compiler options") { |v| options[:compiler_options] = v.split(",") }
 opt.on("-s", "--shared-library") { |v| options[:shared] = v }
-opt.on("-l", "--linker[=VAL]", "selecting linker: gold, lld, and mold.") { |v| options[:linker] = v }
+opt.on("-l", "--linker[=VAL]", "selecting linker: gold, lld, and mold, default: \"gold\".") { |v| options[:linker] = v }
 
 begin
   opt.parse!(ARGV)
diff --git a/test/vaporware/test_compiler.rb b/test/vaporware/test_compiler.rb
index 0a936dc..890b50d 100644
--- a/test/vaporware/test_compiler.rb
+++ b/test/vaporware/test_compiler.rb
@@ -5,11 +5,11 @@ class Vaporware::CompilerTest < Test::Unit::TestCase
   def setup = @generated = ["tmp.s", "tmp.o"]
   def teardown
     File.delete("tmp") if File.exist?("tmp")
-    @generated.map { File.delete(_1) }
+    @generated.map { File.delete(_1) if File.exist?(_1) }
   end
   def test_sample_plus
     @file = "sample/plus.rb"
-    @vaporware = Vaporware::Compiler.compile(@file)
+    @vaporware = Vaporware::Compiler.compile(@file, assembler: "self")
     IO.popen("./tmp").close
     exit_code, handle_code = check_process($?.to_i)
     assert_equal(9, exit_code)