diff --git a/Makefile b/Makefile
index a374fb3..c620a2e 100644
--- a/Makefile
+++ b/Makefile
@@ -13,9 +13,9 @@ global:
 	sudo luarocks make moonscript-dev-1.rockspec
 
 compile:
-	lua5.1 bin/moonc moon/ moonscript/
+	lua bin/moonc moon/ moonscript/
 	echo "#!/usr/bin/env lua" > bin/moon
-	lua5.1 bin/moonc -p bin/moon.moon >> bin/moon
+	lua bin/moonc -p bin/moon.moon >> bin/moon
 	echo "-- vim: set filetype=lua:" >> bin/moon
 
 watch:
diff --git a/moon/init.moon b/moon/init.moon
index ef07bba..5817bc5 100644
--- a/moon/init.moon
+++ b/moon/init.moon
@@ -41,7 +41,7 @@ debug = setmetatable {
 
 -- run a function with scope injected before its function environment
 run_with_scope = (fn, scope, ...) ->
-  old_env = getfenv fn
+  old_env = util.getfenv fn
   env = setmetatable {}, {
     __index: (name) =>
       val = scope[name]
@@ -50,7 +50,7 @@ run_with_scope = (fn, scope, ...) ->
       else
         old_env[name]
   }
-  setfenv fn, env
+  util.setfenv fn, env
   fn ...
 
 -- wrap obj such that calls to methods do not need a reference to self