diff --git a/tests/test-utils.c b/tests/test-utils.c
index 71de8a3..dc0a5f3 100644
--- a/tests/test-utils.c
+++ b/tests/test-utils.c
@@ -27,6 +27,8 @@
 	test->binding.name = "test";
 	test->binding.version = 1;
 	test->binding.tx = mctp_binding_test_tx;
+	test->binding.pkt_size = MCTP_BMTU;
+	test->binding.pkt_pad = 0;
 	return test;
 }
 
@@ -35,7 +37,7 @@
 {
 	struct mctp_pktbuf *pkt;
 
-	pkt = mctp_pktbuf_alloc(len);
+	pkt = mctp_pktbuf_alloc(&test->binding, len);
 	assert(pkt);
 	memcpy(mctp_pktbuf_hdr(pkt), buf, len);
 	mctp_bus_rx(&test->binding, pkt);