diff --git a/include/mbedtls/x509.h b/include/mbedtls/x509.h
index 8dfd1f3..5a9f2b5 100644
--- a/include/mbedtls/x509.h
+++ b/include/mbedtls/x509.h
@@ -243,6 +243,17 @@
  */
 typedef mbedtls_asn1_sequence mbedtls_x509_sequence;
 
+/*
+ * Container for the fields of the Authority Key Identifier object
+ */
+typedef struct mbedtls_x509_authority {
+    mbedtls_x509_buf keyIdentifier;
+    mbedtls_x509_name authorityCertIssuer;
+    mbedtls_x509_buf authorityCertSerialNumber;
+    mbedtls_x509_buf raw;
+}
+mbedtls_x509_authority;
+
 /** Container for date and time (precision in seconds). */
 typedef struct mbedtls_x509_time {
     int year, mon, day;         /**< Date. */