diff --git a/lib/sql-parser/sql_visitor.rb b/lib/sql-parser/sql_visitor.rb
index e1478c7..2084f55 100644
--- a/lib/sql-parser/sql_visitor.rb
+++ b/lib/sql-parser/sql_visitor.rb
@@ -346,7 +346,7 @@ def visit_all(nodes)
     end
 
     def arrayize(arr)
-      visit_all(arr).join(', ')
+      visit_all(Array.wrap(arr)).join(', ')
     end
 
     def aggregate(function_name, o)
@@ -359,4 +359,4 @@ def qualified_join(join_type, o)
     
   end
   
-end
\ No newline at end of file
+end