diff --git a/src/p_saveg.c b/src/p_saveg.c
index 758d917ad..b8d5bb9fc 100644
--- a/src/p_saveg.c
+++ b/src/p_saveg.c
@@ -2022,6 +2022,7 @@ static void SaveMobjThinker(const thinker_t *th, const UINT8 type)
 	if (diff2 & MD2_TERRAIN)
 	{
 		WRITEUINT32(save_p, K_GetTerrainHeapIndex(mobj->terrain));
+		WRITEUINT32(save_p, SaveMobjnum(mobj->terrainOverlay));
 	}
 
 	WRITEUINT32(save_p, mobj->mobjnum);