diff --git a/lib/rt_names.c b/lib/rt_names.c
index a290021..52ecdb2 100644
--- a/lib/rt_names.c
+++ b/lib/rt_names.c
@@ -23,6 +23,10 @@
 
 #include "rt_names.h"
 
+#ifndef CONFDIR
+#define CONFDIR "/etc/iproute2"
+#endif
+
 struct rtnl_hash_entry {
 	struct rtnl_hash_entry *next;
 	char *			name;
@@ -129,7 +133,7 @@
 static void rtnl_rtprot_initialize(void)
 {
 	rtnl_rtprot_init = 1;
-	rtnl_tab_initialize("/etc/iproute2/rt_protos",
+	rtnl_tab_initialize(CONFDIR "/rt_protos",
 			    rtnl_rtprot_tab, 256);
 }
 
@@ -196,7 +200,7 @@
 	rtnl_rtscope_tab[254] = "host";
 	rtnl_rtscope_tab[253] = "link";
 	rtnl_rtscope_tab[200] = "site";
-	rtnl_tab_initialize("/etc/iproute2/rt_scopes",
+	rtnl_tab_initialize(CONFDIR "/rt_scopes",
 			    rtnl_rtscope_tab, 256);
 }
 
@@ -259,7 +263,7 @@
 static void rtnl_rtrealm_initialize(void)
 {
 	rtnl_rtrealm_init = 1;
-	rtnl_tab_initialize("/etc/iproute2/rt_realms",
+	rtnl_tab_initialize(CONFDIR "/rt_realms",
 			    rtnl_rtrealm_tab, 256);
 }
 
@@ -328,7 +332,7 @@
 static void rtnl_rttable_initialize(void)
 {
 	rtnl_rttable_init = 1;
-	rtnl_hash_initialize("/etc/iproute2/rt_tables",
+	rtnl_hash_initialize(CONFDIR "/rt_tables",
 			     rtnl_rttable_hash, 256);
 }
 
@@ -396,7 +400,7 @@
 static void rtnl_rtdsfield_initialize(void)
 {
 	rtnl_rtdsfield_init = 1;
-	rtnl_tab_initialize("/etc/iproute2/rt_dsfield",
+	rtnl_tab_initialize(CONFDIR "/rt_dsfield",
 			    rtnl_rtdsfield_tab, 256);
 }