diff --git a/lib/ruby-debug-ide/xml_printer.rb b/lib/ruby-debug-ide/xml_printer.rb
index b009fddf..4e6fb05c 100644
--- a/lib/ruby-debug-ide/xml_printer.rb
+++ b/lib/ruby-debug-ide/xml_printer.rb
@@ -382,7 +382,7 @@ def print_expression_info(incomplete, prompt, indent)
     end
 
     def print_eval(exp, value)
-      print "<eval expression=\"%s\" value=\"%s\" />", CGI.escapeHTML(exp), value
+      print "<eval expression=\"%s\" value=\"%s\" />", CGI.escapeHTML(exp), CGI.escapeHTML(value)
     end
 
     def print_pp(value)