diff --git a/lib/net/ldap/filter.rb b/lib/net/ldap/filter.rb
index 0ab847b8..aad84f83 100644
--- a/lib/net/ldap/filter.rb
+++ b/lib/net/ldap/filter.rb
@@ -752,7 +752,7 @@ def parse_filter_branch(scanner)
         scanner.scan(/\s*/)
         if op = scanner.scan(/<=|>=|!=|:=|=/)
           scanner.scan(/\s*/)
-          if value = scanner.scan(/(?:[-\[\]{}\w*.+:@=,#\$%&!'^~\s\xC3\x80-\xCA\xAF]|[^\x00-\x7F]|\\[a-fA-F\d]{2})+/u)
+          if value = scanner.scan(/(?:[-\[\]{}\w*.+\/:@=,#\$%&!'^~\s\xC3\x80-\xCA\xAF]|[^\x00-\x7F]|\\[a-fA-F\d]{2})+/u)
             # 20100313 AZ: Assumes that "(uid=george*)" is the same as
             # "(uid=george* )". The standard doesn't specify, but I can find
             # no examples that suggest otherwise.
diff --git a/test/test_filter_parser.rb b/test/test_filter_parser.rb
index 210e0218..6f1ca48b 100644
--- a/test/test_filter_parser.rb
+++ b/test/test_filter_parser.rb
@@ -14,6 +14,10 @@ def test_brackets
     assert_kind_of Net::LDAP::Filter, Net::LDAP::Filter::FilterParser.parse("(cn=[{something}])")
   end
 
+  def test_slash
+    assert_kind_of Net::LDAP::Filter, Net::LDAP::Filter::FilterParser.parse("(departmentNumber=FOO//BAR/FOO)")
+  end
+
   def test_colons
     assert_kind_of Net::LDAP::Filter, Net::LDAP::Filter::FilterParser.parse("(ismemberof=cn=edu:berkeley:app:calmessages:deans,ou=campus groups,dc=berkeley,dc=edu)")
   end