diff --git a/spec/helpers.rb b/spec/helpers.rb
index 4af3a29..8746374 100644
--- a/spec/helpers.rb
+++ b/spec/helpers.rb
@@ -30,13 +30,13 @@ end
 
 def create_ready_vm(template, name, token = nil)
   create_vm(name, token)
-  redis.sadd('vmpooler__ready__' + template, name)
+  redis.sadd("vmpooler__ready__#{template}", name)
   redis.hset("vmpooler_vm_#{name}", "template", template)
 end
 
 def create_running_vm(template, name, token = nil)
   create_vm(name, token)
-  redis.sadd('vmpooler__running__' + template, name)
+  redis.sadd("vmpooler__running__#{template}", name)
   redis.hset("vmpooler__vm__#{name}", "template", template)
 end