diff --git a/src/libsystemd-network/sd-radv.c b/src/libsystemd-network/sd-radv.c
index 7b51f28ff2..33bf4cf79f 100644
--- a/src/libsystemd-network/sd-radv.c
+++ b/src/libsystemd-network/sd-radv.c
@@ -272,9 +272,9 @@ static int radv_recv(sd_event_source *s, int fd, uint32_t revents, void *userdat
 
         r = radv_send(ra, &src, ra->lifetime);
         if (r < 0)
-                log_radv_errno(r, "Unable to send solicited Router Advertisement to %s: %m", addr);
+                log_radv_errno(r, "Unable to send solicited Router Advertisement to %s: %m", strnull(addr));
         else
-                log_radv("Sent solicited Router Advertisement to %s", addr);
+                log_radv("Sent solicited Router Advertisement to %s", strnull(addr));
 
         return 0;
 }