diff --git a/include/mbedtls/pkcs7.h b/include/mbedtls/pkcs7.h
index 2a557bf..52895ac 100644
--- a/include/mbedtls/pkcs7.h
+++ b/include/mbedtls/pkcs7.h
@@ -69,6 +69,7 @@
 #define MBEDTLS_ERR_PKCS7_BAD_INPUT_DATA                   -0x5700  /**< Input invalid. */
 #define MBEDTLS_ERR_PKCS7_ALLOC_FAILED                     -0x5780  /**< Allocation of memory failed. */
 #define MBEDTLS_ERR_PKCS7_VERIFY_FAIL                      -0x5800  /**< Verification Failed */
+#define MBEDTLS_ERR_PKCS7_CERT_DATE_INVALID                -0x5880  /**< The PKCS7 date issued/expired dates are invalid */
 /* \} name */
 
 /**