diff --git a/test/integration_test.rb b/test/integration_test.rb
index b7b7dec9..7d92d4a6 100644
--- a/test/integration_test.rb
+++ b/test/integration_test.rb
@@ -13,7 +13,7 @@ class IntegrationTest < Test::Unit::TestCase
   end
 
   def command
-    cmd = []
+    cmd = ['exec']
     if RbConfig.respond_to? :ruby
       cmd << RbConfig.ruby.inspect
     else