diff --git a/src/libsysprof-profile/sysprof-perf-event-stream.c b/src/libsysprof-profile/sysprof-perf-event-stream.c
index 91e4b45b..4623b2e1 100644
--- a/src/libsysprof-profile/sysprof-perf-event-stream.c
+++ b/src/libsysprof-profile/sysprof-perf-event-stream.c
@@ -448,7 +448,7 @@ sysprof_perf_event_stream_new (GDBusConnection          *connection,
                                struct perf_event_attr   *attr,
                                int                       cpu,
                                int                       group_fd,
-                               gulong                    flags,
+                               guint64                   flags,
                                SysprofPerfEventCallback  callback,
                                gpointer                  callback_data,
                                GDestroyNotify            callback_data_destroy)
@@ -509,7 +509,7 @@ sysprof_perf_event_stream_new (GDBusConnection          *connection,
                                                            -1,
                                                            cpu,
                                                            group_fd_handle,
-                                                           (guint64)flags),
+                                                           flags),
                                             G_VARIANT_TYPE ("(h)"),
                                             G_DBUS_CALL_FLAGS_NONE,
                                             G_MAXUINT,