diff --git a/demos/mac_app/wscript b/demos/mac_app/wscript
index 7dcd94f3..5e798a90 100644
--- a/demos/mac_app/wscript
+++ b/demos/mac_app/wscript
@@ -18,8 +18,8 @@ def options(opt):
 
 def configure(conf):
 	conf.load('compiler_c')
-	conf.env.append_value('FRAMEWORK_COCOA', 'Cocoa')
-	conf.env.ARCH = ['i386', 'x86_64']
+	conf.env.FRAMEWORK_COCOA = 'Cocoa'
+	conf.env.ARCH_COCOA = ['i386', 'x86_64']
 
 def build(bld):
 	bld.program(