1 files changed, 1 insertions, 1 deletions
diff --git a/lib/cgi/util.rb b/lib/cgi/util.rb
index 41ae724c8c..0959f0f094 100644
--- a/lib/cgi/util.rb
+++ b/lib/cgi/util.rb
@@ -55,7 +55,7 @@ class CGI
       end
     end
     asciicompat = Encoding.compatible?(string, "a")
-    string.gsub(/&(apos|amp|quot|gt|lt|\#[0-9]+|\#x[0-9A-Fa-f]+);/) do
+    string.gsub(/&(apos|amp|quot|gt|lt|\#[0-9]+|\#[xX][0-9A-Fa-f]+);/) do
       match = $1.dup
       case match
       when 'apos'                then "'"