diff --git a/src/rdisc/nm-lndp-rdisc.c b/src/rdisc/nm-lndp-rdisc.c
index 809fb84e0d..d40a117de4 100644
--- a/src/rdisc/nm-lndp-rdisc.c
+++ b/src/rdisc/nm-lndp-rdisc.c
@@ -59,7 +59,7 @@ send_rs (NMRDisc *rdisc, GError **error)
 	int errsv;
 
 	errsv = ndp_msg_new (&msg, NDP_MSG_RS);
-	if (!errsv) {
+	if (errsv) {
 		errsv = errsv > 0 ? errsv : -errsv;
 		g_set_error_literal (error, NM_UTILS_ERROR, NM_UTILS_ERROR_UNKNOWN,
 		                     "cannot create router solicitation");