diff --git a/lib/puppet/type/database_user.rb b/lib/puppet/type/database_user.rb
index ef98547..23af104 100644
--- a/lib/puppet/type/database_user.rb
+++ b/lib/puppet/type/database_user.rb
@@ -9,7 +9,7 @@ Puppet::Type.newtype(:database_user) do
     validate do |value|
       # https://dev.mysql.com/doc/refman/5.1/en/account-names.html
       # Regex should problably be more like this: /^[`'"]?[^`'"]*[`'"]?@[`'"]?[\w%\.]+[`'"]?$/
-      raise(ArgumentError, "Invalid database user #{value}") unless value =~ /[\w-]*@[\w%\.]+/
+      raise(ArgumentError, "Invalid database user #{value}") unless value =~ /[\w-]*@[\w%\.:]+/
       username = value.split('@')[0]
       if username.size > 16
         raise ArgumentError, "MySQL usernames are limited to a maximum of 16 characters"