diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index 4384a43..61f0ad4 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -1870,7 +1870,7 @@
     }
     else
     {
-        status = psa_validate_key_id( psa_get_key_id( attributes ), 0, 0 );
+        status = psa_validate_key_id( psa_get_key_id( attributes ), 0 );
         if( status != PSA_SUCCESS )
             return( status );
     }
diff --git a/library/psa_crypto_slot_management.c b/library/psa_crypto_slot_management.c
index 9075beb..d8a3ca8 100644
--- a/library/psa_crypto_slot_management.c
+++ b/library/psa_crypto_slot_management.c
@@ -52,7 +52,7 @@
 static psa_global_data_t global_data;
 
 psa_status_t psa_validate_key_id(
-    mbedtls_svc_key_id_t key, int vendor_ok, int volatile_ok )
+    mbedtls_svc_key_id_t key, int vendor_ok )
 {
     psa_key_id_t key_id = MBEDTLS_SVC_KEY_ID_GET_KEY_ID( key );
 
@@ -62,12 +62,7 @@
 
     if( vendor_ok &&
         ( PSA_KEY_ID_VENDOR_MIN <= key_id ) &&
-        ( key_id < PSA_KEY_ID_VOLATILE_MIN ) )
-        return( PSA_SUCCESS );
-
-    if( volatile_ok &&
-        ( PSA_KEY_ID_VOLATILE_MIN <= key_id ) &&
-        ( key_id <= PSA_KEY_ID_VOLATILE_MAX ) )
+        ( key_id <= PSA_KEY_ID_VENDOR_MAX ) )
         return( PSA_SUCCESS );
 
     return( PSA_ERROR_INVALID_HANDLE );
@@ -122,7 +117,7 @@
     }
     else
     {
-        status = psa_validate_key_id( key, 1, 1 );
+        status = psa_validate_key_id( key, 1 );
         if( status != PSA_SUCCESS )
             return( status );
 
diff --git a/library/psa_crypto_slot_management.h b/library/psa_crypto_slot_management.h
index 8d3c384..75ce0ac 100644
--- a/library/psa_crypto_slot_management.h
+++ b/library/psa_crypto_slot_management.h
@@ -212,13 +212,10 @@
  * \param[in] vendor_ok     Non-zero to indicate that key identifiers in the
  *                          vendor range are allowed, volatile key identifiers
  *                          excepted \c 0 otherwise.
- * \param[in] volatile_ok   Non-zero to indicate that volatile key identifiers
- *                          are allowed \c 0 otherwise.
  *
  * \retval #PSA_SUCCESS The identifier is valid.
  * \retval #PSA_ERROR_INVALID_ARGUMENT The key identifier is not valid.
  */
-psa_status_t psa_validate_key_id(
-    mbedtls_svc_key_id_t key, int vendor_ok, int volatile_ok );
+psa_status_t psa_validate_key_id( mbedtls_svc_key_id_t key, int vendor_ok );
 
 #endif /* PSA_CRYPTO_SLOT_MANAGEMENT_H */