diff --git a/cron.lua b/cron.lua
index de0a823..0dc2fa9 100644
--- a/cron.lua
+++ b/cron.lua
@@ -109,7 +109,7 @@ local function storeScopeInCache(scope)
   local node = scopeCacheRoot
   for i=1, scope.len do
     local tag = scope.tags[i]
-    node.children[tag] = node.children[tag] or { children={} }
+    node.children[tag] = node.children[tag] or { children=setmetatable({},{__mode='k'}) }
     node = node.children[tag]
   end
   node.scope = scope
@@ -165,7 +165,7 @@ end
 function cron.reset()
   entries = {}
   taggedEntries = setmetatable({}, {__mode='k'})
-  scopeCacheRoot = { children = {}}
+  scopeCacheRoot = { children = setmetatable({}, {__mode='k'}) }
 end
 
 -- tagged functions
diff --git a/spec/cron_spec.lua b/spec/cron_spec.lua
index 98eeb49..9b7287e 100644
--- a/spec/cron_spec.lua
+++ b/spec/cron_spec.lua
@@ -159,8 +159,5 @@ describe( 'cron', function()
       assert_equal(counter, 4)
     end)
 
-    it('caches scopes', function()
-      assert_equal(cron.tagged('hello', 'world'), cron.tagged('hello', 'world'))
-    end)
   end)
 end)