diff --git a/ttg/ttg/parsec/buffer.h b/ttg/ttg/parsec/buffer.h
index bd1acf338..72ec386f4 100644
--- a/ttg/ttg/parsec/buffer.h
+++ b/ttg/ttg/parsec/buffer.h
@@ -161,10 +161,10 @@ struct buffer : public detail::ttg_parsec_data_wrapper_t
    * buffer was modified outside of a TTG */
   void set_current_device(const ttg::device::Device& device) {
     assert(is_valid());
+    int parsec_id = detail::ttg_device_to_parsec_device(device);
     /* make sure it's a valid device */
-    assert(parsec_nb_devices > device_id);
+    assert(parsec_nb_devices > device);
     /* make sure it's a valid copy */
-    int parsec_id = detail::ttg_device_to_parsec_device(device);
     assert(m_data->device_copies[parsec_id] != nullptr);
     m_data->owner_device = parsec_id;
   }