1 files changed, 1 insertions, 1 deletions
diff --git a/lib/test/unit.rb b/lib/test/unit.rb
index 8d3a726b9b..651ba0a939 100644
--- a/lib/test/unit.rb
+++ b/lib/test/unit.rb
@@ -116,7 +116,7 @@ module Test
           warn "#{caller(1)[0]}: warning: Parallel running disabled because can't get path to ruby; run specify with --ruby argument"
           options[:parallel] = nil
         else
-          options[:ruby] ||= RbConfig.ruby
+          options[:ruby] ||= [RbConfig.ruby]
         end
 
         true