diff --git a/setup.py b/setup.py
index e405392d7..82563c964 100644
--- a/setup.py
+++ b/setup.py
@@ -204,17 +204,6 @@ class write_data_install_path(cmd.Command):
 		conf_file = open(conf_filename, 'w')
 		conf_file.write(data)
 		conf_file.close()
-		conf_filename = os.path.join(self.lib_build_dir,
-			'deluge', 'interface.py')
-
-		conf_file = open(conf_filename, 'r')
-		data = conf_file.read()
-		conf_file.close()
-		data = data.replace('@datadir@', self.prefix)
-
-		conf_file = open(conf_filename, 'w')
-		conf_file.write(data)
-		conf_file.close()
 
 class unwrite_data_install_path(cmd.Command):
 	description = 'undoes write_data_install_path'
diff --git a/src/interface.py b/src/interface.py
index eaf961f27..cbc2e3aab 100644
--- a/src/interface.py
+++ b/src/interface.py
@@ -48,7 +48,7 @@ import ipc_manager
 import plugins
 import tab_details
 import tab_files
-INSTALL_PREFIX = '@datadir@'
+
 class DelugeGTK:
     def __init__(self):
         self.ipc_manager = ipc_manager.Manager(self)
@@ -123,7 +123,7 @@ class DelugeGTK:
         def new_release_check():
             import os, sys
             py_version = sys.version[:3]
-            file = INSTALL_PREFIX + '/lib/python' + py_version + '/site-packages/deluge/update.py'
+            file = common.INSTALL_PREFIX + '/lib/python' + py_version + '/site-packages/deluge/update.py'
             os.spawnlp(os.P_NOWAIT, 'python', 'python', file, common.PROGRAM_VERSION)
 
         if self.config.get("new_releases"):