diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index 9c8e108..f9169aa 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -1624,9 +1624,8 @@
     }
     else
     {
-        status = psa_validate_key_id( psa_get_key_id( attributes ), 0 );
-        if( status != PSA_SUCCESS )
-            return( status );
+        if( !psa_is_valid_key_id( psa_get_key_id( attributes ), 0 ) )
+            return( PSA_ERROR_INVALID_ARGUMENT );
     }
 
     status = psa_validate_key_policy( &attributes->core.policy );
diff --git a/library/psa_crypto_slot_management.c b/library/psa_crypto_slot_management.c
index dcbee31..f8e2276 100644
--- a/library/psa_crypto_slot_management.c
+++ b/library/psa_crypto_slot_management.c
@@ -51,21 +51,20 @@
 
 static psa_global_data_t global_data;
 
-psa_status_t psa_validate_key_id(
-    mbedtls_svc_key_id_t key, int vendor_ok )
+int psa_is_valid_key_id( mbedtls_svc_key_id_t key, int vendor_ok )
 {
     psa_key_id_t key_id = MBEDTLS_SVC_KEY_ID_GET_KEY_ID( key );
 
     if( ( PSA_KEY_ID_USER_MIN <= key_id ) &&
         ( key_id <= PSA_KEY_ID_USER_MAX ) )
-        return( PSA_SUCCESS );
+        return( 1 );
 
     if( vendor_ok &&
         ( PSA_KEY_ID_VENDOR_MIN <= key_id ) &&
         ( key_id <= PSA_KEY_ID_VENDOR_MAX ) )
-        return( PSA_SUCCESS );
+        return( 1 );
 
-    return( PSA_ERROR_INVALID_HANDLE );
+    return( 0 );
 }
 
 /** Get the description in memory of a key given its identifier and lock it.
@@ -124,9 +123,8 @@
     }
     else
     {
-        status = psa_validate_key_id( key, 1 );
-        if( status != PSA_SUCCESS )
-            return( status );
+        if ( !psa_is_valid_key_id( key, 1 ) )
+            return( PSA_ERROR_INVALID_HANDLE );
 
         for( slot_idx = 0; slot_idx < MBEDTLS_PSA_KEY_SLOT_COUNT; slot_idx++ )
         {
diff --git a/library/psa_crypto_slot_management.h b/library/psa_crypto_slot_management.h
index 1b0cb26..d539bdd 100644
--- a/library/psa_crypto_slot_management.h
+++ b/library/psa_crypto_slot_management.h
@@ -217,9 +217,8 @@
  *                          vendor range are allowed, volatile key identifiers
  *                          excepted \c 0 otherwise.
  *
- * \retval #PSA_SUCCESS The identifier is valid.
- * \retval #PSA_ERROR_INVALID_ARGUMENT The key identifier is not valid.
+ * \retval <> 0 if the key identifier is valid, 0 otherwise.
  */
-psa_status_t psa_validate_key_id( mbedtls_svc_key_id_t key, int vendor_ok );
+int psa_is_valid_key_id( mbedtls_svc_key_id_t key, int vendor_ok );
 
 #endif /* PSA_CRYPTO_SLOT_MANAGEMENT_H */