diff --git a/soundlib/InstrumentExtensions.cpp b/soundlib/InstrumentExtensions.cpp
index 8997a111a9b..237ed9303c5 100644
--- a/soundlib/InstrumentExtensions.cpp
+++ b/soundlib/InstrumentExtensions.cpp
@@ -332,9 +332,6 @@ void WriteInstrumentHeaderStructOrField(ModInstrument * input, std::ostream &fil
 	WRITE_MPTHEADER_sized_member(	PitchEnv.nReleaseNode		, uint8		, MagicBE("PERN")	)
 	WRITE_MPTHEADER_sized_member(	PanEnv.nReleaseNode			, uint8		, MagicBE("AERN")	)
 	WRITE_MPTHEADER_sized_member(	VolEnv.nReleaseNode			, uint8		, MagicBE("VERN")	)
-	WRITE_MPTHEADER_sized_member(	PitchEnv.dwFlags			, uint8		, MagicBE("PFLG")	)
-	WRITE_MPTHEADER_sized_member(	PanEnv.dwFlags				, uint8		, MagicBE("AFLG")	)
-	WRITE_MPTHEADER_sized_member(	VolEnv.dwFlags				, uint8		, MagicBE("VFLG")	)
 	WRITE_MPTHEADER_sized_member(	midiPWD						, int8		, MagicBE("MPWD")	)
 	// clang-format on