diff --git a/dnsviz/config.py.in b/dnsviz/config.py.in
index 373fde2..007f0f1 100644
--- a/dnsviz/config.py.in
+++ b/dnsviz/config.py.in
@@ -26,12 +26,7 @@
 import os
 import sys

-_prefix = '__DNSVIZ_INSTALL_PREFIX__'
-if (hasattr(sys, 'real_prefix') or hasattr(sys, 'base_prefix')) and \
-        not _prefix:
-    DNSVIZ_INSTALL_PREFIX = sys.prefix
-else:
-    DNSVIZ_INSTALL_PREFIX = _prefix
+DNSVIZ_INSTALL_PREFIX = "@out@"
 DNSVIZ_SHARE_PATH = os.getenv('DNSVIZ_SHARE_PATH', os.path.join(DNSVIZ_INSTALL_PREFIX, 'share', 'dnsviz'))
 JQUERY_PATH = __JQUERY_PATH__
 JQUERY_UI_PATH = __JQUERY_UI_PATH__