diff --git a/astpcie.h b/astpcie.h
new file mode 100644
index 0000000..a64b2dc
--- /dev/null
+++ b/astpcie.h
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later */
+
+/* This is a private header file defining binding structure for PCIe binding */
+
+#ifndef _ASTPCIE_H
+#define _ASTPCIE_H
+
+#include "libmctp.h"
+
+#define MCTP_ASTPCIE_BINDING_DEFAULT_BUFFER     1024
+
+struct mctp_binding_astpcie {
+    struct mctp_binding binding;
+    int fd;
+
+    struct mctp_pktbuf *rx_pkt;
+
+    /* placeholder for buffer */
+    uint8_t rxbuf[MCTP_ASTPCIE_BINDING_DEFAULT_BUFFER];
+};
+
+#endif