diff --git a/deep.lua b/deep.lua
index ffd545c..89f6a3d 100644
--- a/deep.lua
+++ b/deep.lua
@@ -26,8 +26,7 @@ local deep = {
 }
 
 local execQueue = {}
-local maxIndex = 1
-local minIndex = 1
+local execKeys = {}
 
 -- for compatibility with Lua 5.1/5.2
 local unpack = rawget(table, "unpack") or unpack
@@ -44,13 +43,7 @@ deep.queue = function(i, fun, ...)
   end
 
   local arg = { ... }
-
-  if i < minIndex then
-    minIndex = i
-  elseif i > maxIndex then
-    maxIndex = i
-  end
-
+  
   if arg and #arg > 0 then
     local t = function() return fun(unpack(arg)) end
 
@@ -66,18 +59,23 @@ deep.queue = function(i, fun, ...)
       table.insert(execQueue[i], fun)
     end
   end
+  
+  table.insert(execKeys, i)
 end
 
 deep.execute = function()
-  for i = minIndex, maxIndex do
-    if execQueue[i] then
-      for _, fun in pairs(execQueue[i]) do
-        fun()
+  if next(execQueue) ~= nil then
+    table.sort(execKeys)
+    
+    for k = 1, #execKeys do
+      for i = 1, #execQueue[execKeys[k]] do
+        execQueue[execKeys[k]][i]()
       end
     end
+    
+    execQueue = {}
+    execKeys = {}
   end
-
-  execQueue = {}
 end
 
 return deep