diff --git a/bin/tests/system/dyndb/driver/db.c b/bin/tests/system/dyndb/driver/db.c
index d9d4dd8121..6799d3b2e2 100644
--- a/bin/tests/system/dyndb/driver/db.c
+++ b/bin/tests/system/dyndb/driver/db.c
@@ -756,7 +756,7 @@ create_db(isc_mem_t *mctx, dns_name_t *origin, dns_dbtype_t type,
 	sampledb_t *sampledb = NULL;
 	isc_result_t result;
 	dns_dbversion_t *version = NULL;
-	struct in_addr a_addr = { 0x0100007f };
+	struct in_addr a_addr;
 
 	REQUIRE(type == dns_dbtype_zone);
 	REQUIRE(rdclass == dns_rdataclass_in);
@@ -767,6 +767,8 @@ create_db(isc_mem_t *mctx, dns_name_t *origin, dns_dbtype_t type,
 
 	UNUSED(driverarg); /* no driver-specific configuration */
 
+	a_addr.s_addr = 0x0100007fU;
+
 	CHECKED_MEM_GET_PTR(mctx, sampledb);
 	ZERO_PTR(sampledb);