diff --git a/wscript b/wscript
index 97f13a2..ce27968 100644
--- a/wscript
+++ b/wscript
@@ -38,7 +38,7 @@
 
     conf.check_boost(lib="system thread")
 
-    if not conf.options.with_qt4 and not not conf.options.with_qt4 and Utils.unversioned_sys_platform() == "darwin":
+    if not conf.options.with_qt4 and not conf.options.with_qt5 and Utils.unversioned_sys_platform() == "darwin":
         conf.env.BUILD_OSX_NATIVE = 1
         conf.recurse('osx')
     else: