1 files changed, 1 insertions, 0 deletions
diff --git a/pref.h b/pref.h
index e59ad1c6a..29c9df2f0 100644
--- a/pref.h
+++ b/pref.h
@@ -28,6 +28,7 @@ struct preferences {
 	short profile_calc_ceiling;
 	short calc_ceiling_3m_incr;
 	short calc_all_tissues;
+	short calc_ndl_tts;
 	short gflow;
 	short gfhigh;
 	int map_provider;