diff --git a/package/radvd/radvd.mk b/package/radvd/radvd.mk
index 5958d9145b..a42d8583f7 100644
--- a/package/radvd/radvd.mk
+++ b/package/radvd/radvd.mk
@@ -8,6 +8,8 @@ RADVD_VERSION = 1.13
 RADVD_SOURCE = radvd-$(RADVD_VERSION).tar.xz
 RADVD_SITE = http://www.litech.org/radvd/dist
 RADVD_DEPENDENCIES = host-bison flex libdaemon host-flex host-pkgconf
+# clock_gettime() requires -lrt when linking against glibc older than 2.17
+RADVD_CONF_ENV = LIBS=-lrt
 
 define RADVD_INSTALL_INITSCRIPT
 	$(INSTALL) -m 0755 package/radvd/S50radvd $(TARGET_DIR)/etc/init.d