diff --git a/src/p_sectors.cpp b/src/p_sectors.cpp
index 1f65e952f..fb4789e17 100644
--- a/src/p_sectors.cpp
+++ b/src/p_sectors.cpp
@@ -2490,9 +2490,9 @@ DEFINE_FIELD_X(Sector, sector_t, thinglist)
 DEFINE_FIELD_X(Sector, sector_t, friction)
 DEFINE_FIELD_X(Sector, sector_t, movefactor)
 DEFINE_FIELD_X(Sector, sector_t, terrainnum)
-DEFINE_FIELD_UNSIZED(Sector, sector_t, floordata)
-DEFINE_FIELD_UNSIZED(Sector, sector_t, ceilingdata)
-DEFINE_FIELD_UNSIZED(Sector, sector_t, lightingdata)
+DEFINE_FIELD_X(Sector, sector_t, floordata)
+DEFINE_FIELD_X(Sector, sector_t, ceilingdata)
+DEFINE_FIELD_X(Sector, sector_t, lightingdata)
 DEFINE_FIELD_X(Sector, sector_t, interpolations)
 DEFINE_FIELD_X(Sector, sector_t, soundtraversed)
 DEFINE_FIELD_X(Sector, sector_t, stairlock)