diff --git a/moonscript/compile.moon b/moonscript/compile.moon
index ed480f1..2062310 100644
--- a/moonscript/compile.moon
+++ b/moonscript/compile.moon
@@ -82,6 +82,9 @@ class Block_
   has_name: (name) =>
     @_names[name]
 
+  shadow_name: (name) =>
+    @_names[name] = false
+
   free_name: (prefix, dont_put) =>
     prefix = prefix or "moon"
     searching = true
diff --git a/moonscript/compile/line.moon b/moonscript/compile/line.moon
index 02e16f1..123e0b2 100644
--- a/moonscript/compile/line.moon
+++ b/moonscript/compile/line.moon
@@ -177,6 +177,7 @@ line_compile =
         \stm {"assign", {items_tmp}, {iter}}
 
         block = [s for s in *block]
+        \shadow_name name for name in *names
         insert block, 1, {"assign", names, {
           {"chain", items_tmp, {"index", index_tmp}}
         }}
diff --git a/tests/outputs/lists.lua b/tests/outputs/lists.lua
index 92608a8..dce68b5 100644
--- a/tests/outputs/lists.lua
+++ b/tests/outputs/lists.lua
@@ -152,7 +152,7 @@ local double = (function()
   do
     local _item_0 = items
     for _index_0 = 1, #_item_0 do
-      x = _item_0[_index_0]
+      local x = _item_0[_index_0]
       table.insert(_accum_0, x * 2)
     end
   end
@@ -161,7 +161,7 @@ end)()
 do
   local _item_0 = double
   for _index_0 = 1, #_item_0 do
-    x = _item_0[_index_0]
+    local x = _item_0[_index_0]
     print(x)
   end
 end
@@ -170,7 +170,7 @@ local cut = (function()
   do
     local _item_0 = items
     for _index_0 = 1, #_item_0 do
-      x = _item_0[_index_0]
+      local x = _item_0[_index_0]
       if x > 3 then
         table.insert(_accum_0, x)
       end
@@ -183,7 +183,7 @@ local hello = (function()
   do
     local _item_0 = items
     for _index_0 = 1, #_item_0 do
-      x = _item_0[_index_0]
+      local x = _item_0[_index_0]
       do
         local _item_1 = items
         for _index_1 = 1, #_item_1 do