diff --git a/source/games/sw/src/copysect.cpp b/source/games/sw/src/copysect.cpp
index 9d021659e..f5ec31ae8 100644
--- a/source/games/sw/src/copysect.cpp
+++ b/source/games/sw/src/copysect.cpp
@@ -214,7 +214,7 @@ void CopySectorMatch(int match)
                 dsectp->speed        = ssectp->speed;
                 dsectp->damage       = ssectp->damage;
                 dsectp->number       = ssectp->number;
-                dsectp->u_defined    = ssectp->u_defined;
+                if (ssectp->u_defined) dsectp->u_defined    = true;
                 dsectp->flags2       = ssectp->flags2;
 
                 dsectp->hitag = ssectp->hitag;
diff --git a/source/games/sw/src/track.cpp b/source/games/sw/src/track.cpp
index 4ab6171c5..e1b16aa02 100644
--- a/source/games/sw/src/track.cpp
+++ b/source/games/sw/src/track.cpp
@@ -2192,7 +2192,8 @@ void CallbackSOsink(ANIMp ap, void *data)
 //    destsect->floorz = srcsect->floorz;
 
     RESET(destsect->floorstat, CSTAT_SECTOR_ALIGN);
-    ASSERT(destsect->hasU() && srcsect->hasU());
+    destsect->u_defined = true;
+    ASSERT(srcsect->hasU());
 
     tgt_depth = FixedToInt(srcsect->depth_fixed);