diff --git a/scripts/mk_util.py b/scripts/mk_util.py
index 6a755634d..e1a1c5628 100644
--- a/scripts/mk_util.py
+++ b/scripts/mk_util.py
@@ -591,7 +591,6 @@ if os.name == 'nt':
 elif os.name == 'posix':
     if os.uname()[0] == 'Darwin':
         IS_OSX=True
-        PREFIX="/usr/local"
     elif os.uname()[0] == 'Linux':
         IS_LINUX=True
     elif os.uname()[0] == 'GNU':