diff --git a/src/BufferParams.h b/src/BufferParams.h
index a141dedc45..2c4828e1c4 100644
--- a/src/BufferParams.h
+++ b/src/BufferParams.h
@@ -349,8 +349,6 @@ public:
 	Package use_mhchem;
 	/// Whether and how to load mathdots
 	Package use_mathdots;
-	/// Whether and how to load undertilde
-	Package use_undertilde;
 	/// Split bibliography?
 	bool use_bibtopic;
 	/// Split the index?