diff --git a/sys/include/net/gnrc/ipv6/nib/conf.h b/sys/include/net/gnrc/ipv6/nib/conf.h
index 09c686c6a314..48f030bde42c 100644
--- a/sys/include/net/gnrc/ipv6/nib/conf.h
+++ b/sys/include/net/gnrc/ipv6/nib/conf.h
@@ -65,7 +65,7 @@ extern "C" {
 # endif
 # ifndef CONFIG_GNRC_IPV6_NIB_NUMOF
 /* only needs to store default router */
-# define CONFIG_GNRC_IPV6_NIB_NUMOF                  (1)
+# define CONFIG_GNRC_IPV6_NIB_NUMOF                  (1 + IS_ACTIVE(CONFIG_GNRC_IPV6_NIB_SLAAC_TEMPORARY_ADDRESSES))
 # endif
 #endif
 #endif