diff --git a/mod_diskuse.c b/mod_diskuse.c
index 0e0a0d0..7eb5edf 100644
--- a/mod_diskuse.c
+++ b/mod_diskuse.c
@@ -53,6 +53,12 @@
 
 #define MOD_DISKUSE_VERSION		"mod_diskuse/0.9"
 
+#define pr_parse_expression     pr_expr_create
+#define pr_class_or_expression  pr_expr_eval_class_or
+#define pr_group_and_expression pr_expr_eval_group_and
+#define pr_group_or_expression  pr_expr_eval_group_or
+#define pr_user_or_expression   pr_expr_eval_user_or
+
 static unsigned char have_max_diskuse = FALSE;
 static double min_diskfree = 0.0;
 static double current_diskfree = 0.0;