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diff --git a/src/decode-esp.h b/src/decode-esp.h
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+/* Copyright (C) 2020 Open Information Security Foundation
+ *
+ * You can copy, redistribute or modify this Program under the terms of
+ * the GNU General Public License version 2 as published by the Free
+ * Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+/**
+ * \file
+ */
+
+#ifndef __DECODE_ESP_H__
+#define __DECODE_ESP_H__
+
+/** \brief size of the ESP header */
+#define ESP_HEADER_LEN 8
+
+#define ESP_GET_RAW_SPI(esph)      SCNtohl((esph)->spi)
+#define ESP_GET_RAW_SEQUENCE(esph) SCNtohl((esph)->sequence)
+
+/** \brief Get the spi field off a packet */
+#define ESP_GET_SPI(p) ESP_GET_RAW_SPI(p->esph)
+
+/** \brief Get the sequence field off a packet */
+#define ESP_GET_SEQUENCE(p) ESP_GET_RAW_SEQUENCE(p->esph)
+
+/** \brief ESP Header */
+typedef struct ESPHdr_ {
+    uint32_t spi;      /** < ESP Security Parameters Index */
+    uint32_t sequence; /** < ESP sequence number */
+} __attribute__((__packed__)) ESPHdr;
+
+#define CLEAR_ESP_PACKET(p)                                                                        \
+    {                                                                                              \
+        (p)->esph = NULL;                                                                          \
+    }                                                                                              \
+    while (0)
+
+void DecodeESPRegisterTests(void);
+
+#endif /* __DECODE_ESP_H__ */