diff --git a/test/lib/iscsi/common.c b/test/lib/iscsi/common.c
index 8ca4f2134..e7a0fd4b5 100644
--- a/test/lib/iscsi/common.c
+++ b/test/lib/iscsi/common.c
@@ -33,6 +33,7 @@ spdk_put_pdu(struct spdk_iscsi_pdu *pdu)
 	if (!pdu)
 		return;
 
+	pdu->ref--;
 	if (pdu->ref < 0) {
 		CU_FAIL("negative ref count");
 		pdu->ref = 0;
diff --git a/test/lib/iscsi/pdu/pdu.c b/test/lib/iscsi/pdu/pdu.c
index 529567105..158c10b99 100644
--- a/test/lib/iscsi/pdu/pdu.c
+++ b/test/lib/iscsi/pdu/pdu.c
@@ -104,8 +104,7 @@ maxburstlength_test(void)
 	struct spdk_iscsi_conn conn;
 	struct spdk_scsi_dev dev;
 	struct spdk_scsi_lun lun;
-	struct spdk_iscsi_pdu *req_pdu;
-	struct spdk_iscsi_pdu *data_out_pdu;
+	struct spdk_iscsi_pdu *req_pdu, *data_out_pdu, *r2t_pdu;
 	struct iscsi_bhs_scsi_req *req;
 	struct iscsi_bhs_r2t *r2t;
 	struct iscsi_bhs_data_out *data_out;
@@ -177,6 +176,19 @@ maxburstlength_test(void)
 
 	rc = spdk_iscsi_execute(&conn, data_out_pdu);
 	CU_ASSERT(rc == SPDK_ISCSI_CONNECTION_FATAL);
+
+	CU_ASSERT(response_pdu->task != NULL);
+	spdk_iscsi_task_disassociate_pdu(response_pdu->task);
+	spdk_iscsi_task_put(response_pdu->task);
+	spdk_put_pdu(response_pdu);
+
+	r2t_pdu = TAILQ_FIRST(&conn.write_pdu_list);
+	CU_ASSERT(r2t_pdu != NULL);
+	TAILQ_REMOVE(&conn.write_pdu_list, r2t_pdu, tailq);
+	spdk_put_pdu(r2t_pdu);
+
+	spdk_put_pdu(data_out_pdu);
+	spdk_put_pdu(req_pdu);
 }
 
 int
diff --git a/unittest.sh b/unittest.sh
index 1acaa960e..6b3479a36 100755
--- a/unittest.sh
+++ b/unittest.sh
@@ -68,10 +68,9 @@ $valgrind test/lib/scsi/lun/lun_ut
 $valgrind test/lib/scsi/scsi_bdev/scsi_bdev_ut
 $valgrind test/lib/scsi/scsi_nvme/scsi_nvme_ut
 
-# TODO: fix valgrind warnings and add $valgrind to iSCSI tests
 $valgrind test/lib/iscsi/param/param_ut
 $valgrind test/lib/iscsi/target_node/target_node_ut test/lib/iscsi/target_node/target_node.conf
-test/lib/iscsi/pdu/pdu
+$valgrind test/lib/iscsi/pdu/pdu
 
 $valgrind test/lib/util/bit_array/bit_array_ut
 $valgrind test/lib/util/io_channel/io_channel_ut