diff --git a/lib/filter/init.rb b/lib/filter/init.rb
index 49a939507..3437f3239 100644
--- a/lib/filter/init.rb
+++ b/lib/filter/init.rb
@@ -59,7 +59,7 @@ module BeEF
     def self.is_valid_browser_plugins?(str)
       return false if not BeEF::Filter.is_non_empty_string?(str)
       return false if str.length > 255  
-      return (str =~ /[^\w\d\s()-.,;_\302\256]/).nil? # \302\256 is the (r) character
+      return (str =~ /[^\w\d\s()-.,;_!\302\256]/).nil? # \302\256 is the (r) character
     end
 
   end