diff --git a/cron.lua b/cron.lua
index 2d70440..0cc7582 100644
--- a/cron.lua
+++ b/cron.lua
@@ -84,12 +84,8 @@ end
 function cron.update(dt)
   assert(type(dt) == "number" and dt >= 0, "dt must be a non-negative number")
 
-  local expired = {}
   for id, entry in pairs(entries) do
-    if entry:update(dt) then expired[id] = true end
-  end
-  for id,_ in pairs(expired) do
-    entries[id] = nil
+    if entry:update(dt) then entries[id] = nil end
   end
 end