diff --git a/plat/intel/soc/common/include/socfpga_mailbox.h b/plat/intel/soc/common/include/socfpga_mailbox.h
index e5e1d14..042532c 100644
--- a/plat/intel/soc/common/include/socfpga_mailbox.h
+++ b/plat/intel/soc/common/include/socfpga_mailbox.h
@@ -79,6 +79,7 @@
 #define MBOX_FCS_GET_DIGEST_REQ				0x82
 #define MBOX_FCS_MAC_VERIFY_REQ				0x83
 #define MBOX_FCS_ECDSA_SHA2_DATA_SIGN_REQ		0x85
+#define MBOX_FCS_ECDSA_SHA2_DATA_SIGN_VERIFY		0x87
 #define MBOX_FCS_ECDSA_GET_PUBKEY			0x88
 #define MBOX_FCS_OPEN_CS_SESSION			0xA0
 #define MBOX_FCS_CLOSE_CS_SESSION			0xA1