diff --git a/conf/config.php b/conf/config.php
index e28b566..aca8304 100644
--- a/conf/config.php
+++ b/conf/config.php
@@ -62,15 +62,15 @@
 	// then most probably you are using the CGI binary. If you are unsure what to 
 	// put in here, ask your hosting provider.
 
-	define('TTRSS_LOCK_DIRECTORY=lock');
+	putenv('TTRSS_LOCK_DIRECTORY=lock');
 	// Directory for lockfiles, must be writable to the user you run
 	// daemon process or cronjobs under.
 
-	define('TTRSS_CACHE_DIR=cache');
+	putenv('TTRSS_CACHE_DIR=cache');
 	// Local cache directory for RSS feed content.
 
-	define('TTRSS_ICONS_DIR=feed-icons');
-	define('TTRSS_ICONS_URL=feed-icons');
+	putenv('TTRSS_ICONS_DIR=feed-icons');
+	putenv('TTRSS_ICONS_URL=feed-icons');
 	// Local and URL path to the directory, where feed favicons are stored.
 	// Unless you really know what you're doing, please keep those relative
 	// to tt-rss main directory.