diff --git a/src/sirius_interface.F b/src/sirius_interface.F
index ec17939bf0..69358ac4a4 100644
--- a/src/sirius_interface.F
+++ b/src/sirius_interface.F
@@ -44,6 +44,7 @@ MODULE sirius_interface
                                               section_vals_val_get
    USE kinds,                           ONLY: default_string_length,&
                                               dp
+   USE machine,                         ONLY: m_flush
    USE mathconstants,                   ONLY: fourpi,&
                                               gamma1
    USE message_passing,                 ONLY: mp_para_env_type