diff --git a/manifests/init.pp b/manifests/init.pp
index 7cebbfc..2b11483 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -46,7 +46,7 @@ class java(
 ) {
   include java::params
 
-  validate_re($version, 'present|installed|latest|^[._0-9a-zA-Z:-]+$')
+  validate_re($version, 'present|installed|latest|^[.+_0-9a-zA-Z:-]+$')
 
   if has_key($java::params::java, $distribution) {
     $default_package_name     = $java::params::java[$distribution]['package']