diff --git a/lib/dns/rdata.c b/lib/dns/rdata.c
index 13cccae9f6..f7f9a9deb5 100644
--- a/lib/dns/rdata.c
+++ b/lib/dns/rdata.c
@@ -2433,12 +2433,14 @@ svcb_hashttp(isc_textregion_t *alpn) {
 isc_result_t
 dns_rdata_checksvcb(const dns_name_t *owner, const dns_rdata_t *rdata) {
 	dns_rdata_in_svcb_t svcb;
+	isc_result_t result;
 
 	REQUIRE(owner != NULL);
 	REQUIRE(rdata != NULL);
 	REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));
 
-	dns_rdata_tostruct(rdata, &svcb, NULL);
+	result = dns_rdata_tostruct(rdata, &svcb, NULL);
+	RUNTIME_CHECK(result == ISC_R_SUCCESS);
 
 	/*
 	 * Check that Alias Mode records don't have SvcParamKeys.