diff --git a/src/net/tcp/httpcore.c b/src/net/tcp/httpcore.c
index af2a237cf..7052bbbad 100644
--- a/src/net/tcp/httpcore.c
+++ b/src/net/tcp/httpcore.c
@@ -1090,7 +1090,8 @@ static int http_tx_request ( struct http_transaction *http ) {
 	}
 
 	/* Allocate I/O buffer */
-	iobuf = alloc_iob ( len + 1 /* NUL */ + http->request.content.len );
+	iobuf = xfer_alloc_iob ( &http->conn, ( len + 1 /* NUL */ +
+						http->request.content.len ) );
 	if ( ! iobuf ) {
 		rc = -ENOMEM;
 		goto err_alloc;
diff --git a/src/net/tcp/oncrpc.c b/src/net/tcp/oncrpc.c
index cb66aeb85..64734a808 100644
--- a/src/net/tcp/oncrpc.c
+++ b/src/net/tcp/oncrpc.c
@@ -150,7 +150,7 @@ int oncrpc_call ( struct interface *intf, struct oncrpc_session *session,
 	frame_size  = oncrpc_compute_size ( header );
 	frame_size += oncrpc_compute_size ( fields );
 
-	io_buf = alloc_iob ( frame_size );
+	io_buf = xfer_alloc_iob ( intf, frame_size );
 	if ( ! io_buf )
 		return -ENOBUFS;