diff --git a/lib/uri/ldap.rb b/lib/uri/ldap.rb
index a2043ccdf5..14e6163292 100644
--- a/lib/uri/ldap.rb
+++ b/lib/uri/ldap.rb
@@ -118,6 +118,7 @@ module URI
 
     # Private method to cleanup +dn+ from using the +path+ component attribute.
     def parse_dn
+      raise InvalidURIError, 'bad LDAP URL' unless @path
       @dn = @path[1..-1]
     end
     private :parse_dn
diff --git a/test/uri/test_ldap.rb b/test/uri/test_ldap.rb
index adad4454b5..64845e487a 100644
--- a/test/uri/test_ldap.rb
+++ b/test/uri/test_ldap.rb
@@ -95,6 +95,10 @@ class TestLDAP < Test::Unit::TestCase
       u.select(:scheme, :host, :not_exist, :port)
     end
   end
+
+  def test_parse_invalid_uri
+    assert_raise(URI::InvalidURIError) {URI.parse("ldap:https://example.com")}
+  end
 end