diff --git a/test/test-main.rb b/test/test-main.rb
index eca7b21..eed7e51 100644
--- a/test/test-main.rb
+++ b/test/test-main.rb
@@ -273,7 +273,7 @@ END
       errmsgs << <<'END'
 7: syntax error, unexpected $end, expecting keyword_end
 END
-    elsif ruby20? || ruby21? || ruby22?
+    elsif ruby20? || ruby21? || ruby22? || ruby23?
       errmsgs << <<'END'
 3: syntax error, unexpected ']', expecting ')'
  _buf << '  <li>'; _buf << ( item[:name]] ).to_s; _buf << '</li>
diff --git a/test/test-users-guide.rb b/test/test-users-guide.rb
index af6c006..620a556 100644
--- a/test/test-users-guide.rb
+++ b/test/test-users-guide.rb
@@ -28,7 +28,7 @@ class KwarkUsersGuideTest < Test::Unit::TestCase
     s =~ /\A\$ (.*?)\n/
     command = $1
     expected = $'
-    if ruby19? || ruby20? || ruby21? || ruby22?
+    if ruby19? || ruby20? || ruby21? || ruby22? || ruby23?
       case @name
       when 'test_main_program1_result'
         expected.sub!('["eruby", "items", "x", "_buf"]', '[:_buf, :eruby, :items, :x]')
diff --git a/test/testutil.rb b/test/testutil.rb
index e9130b7..13db7d5 100644
--- a/test/testutil.rb
+++ b/test/testutil.rb
@@ -29,6 +29,10 @@ def ruby22?  # :nodoc:
   RUBY_VERSION =~ /\A2.2/
 end
 
+def ruby23?  # :nodoc:
+  RUBY_VERSION =~ /\A2.3/
+end
+
 def rubinius?  # :nodoc:
   defined?(RUBY_ENGINE) && RUBY_ENGINE == "rbx"
 end