diff --git a/include/psa/crypto_platform.h b/include/psa/crypto_platform.h
index 86af08f..572f40c 100644
--- a/include/psa/crypto_platform.h
+++ b/include/psa/crypto_platform.h
@@ -89,6 +89,7 @@
  * `psa_key_file_id_t` argument. As a workaround, make `psa_key_id_t` an
  * alias for `psa_key_file_id_t` when building for a multi-client service. */
 typedef psa_key_file_id_t psa_key_id_t;
+#define PSA_KEY_ID_INIT {0, 0}
 
 #else /* !MBEDTLS_PSA_CRYPTO_KEY_FILE_ID_ENCODES_OWNER */
 
diff --git a/include/psa/crypto_struct.h b/include/psa/crypto_struct.h
index b1db423..5296202 100644
--- a/include/psa/crypto_struct.h
+++ b/include/psa/crypto_struct.h
@@ -379,7 +379,7 @@
     psa_key_attributes_flag_t flags;
 } psa_core_key_attributes_t;
 
-#define PSA_CORE_KEY_ATTRIBUTES_INIT {0, 0, 0, PSA_KEY_POLICY_INIT, 0, 0}
+#define PSA_CORE_KEY_ATTRIBUTES_INIT {0, 0, PSA_KEY_ID_INIT, PSA_KEY_POLICY_INIT, 0, 0}
 
 struct psa_key_attributes_s
 {
diff --git a/include/psa/crypto_types.h b/include/psa/crypto_types.h
index 9af4957..b79c3b5 100644
--- a/include/psa/crypto_types.h
+++ b/include/psa/crypto_types.h
@@ -120,6 +120,7 @@
  * psa_key_id_t in crypto_platform.h instead of here. */
 #if !defined(MBEDTLS_PSA_CRYPTO_KEY_FILE_ID_ENCODES_OWNER)
 typedef uint32_t psa_key_id_t;
+#define PSA_KEY_ID_INIT 0
 #endif
 
 /**@}*/