diff --git a/src/calibre/utils/ipc/launch.py b/src/calibre/utils/ipc/launch.py
index 03df14c538..8cfd100b9a 100644
--- a/src/calibre/utils/ipc/launch.py
+++ b/src/calibre/utils/ipc/launch.py
@@ -48,16 +48,6 @@ class Worker(object):
 
     exe_name = 'calibre-parallel'
 
-    @property
-    def osx_interpreter(self):
-        exe = os.path.basename(sys.executable)
-        return exe if 'python' in exe else 'python'
-
-    @property
-    def osx_contents_dir(self):
-        fd = os.path.realpath(getattr(sys, 'frameworks_dir'))
-        return os.path.dirname(fd)
-
     @property
     def executable(self):
         if hasattr(sys, 'running_from_setup'):