diff --git a/lib/puppet/type/rvm_gem.rb b/lib/puppet/type/rvm_gem.rb
index e8aba2d7..07b83688 100644
--- a/lib/puppet/type/rvm_gem.rb
+++ b/lib/puppet/type/rvm_gem.rb
@@ -86,7 +86,7 @@ def insync?(is)
           end
 
           case is
-          when is.is_a?(Array)
+          when Array
             if is.include?(@latest)
               return true
             else