diff --git a/source/core/sectorgeometry.cpp b/source/core/sectorgeometry.cpp
index 32ab645b8..38c5c53cf 100644
--- a/source/core/sectorgeometry.cpp
+++ b/source/core/sectorgeometry.cpp
@@ -305,7 +305,7 @@ void SectorGeometry::ValidateSector(unsigned int secnum, int plane)
 			sec->floorypan_ == compare->floorypan_ &&
 			sec->floorz == compare->floorz &&
 			wall[sec->wallptr].pos == data[secnum].poscompare &&
-			wall[wall[sec->wallptr].point2].pos == data[secnum].poscompare &&
+			wall[wall[sec->wallptr].point2].pos == data[secnum].poscompare2 &&
 			!(sec->dirty & 1) && data[secnum].planes[plane].vertices.Size() ) return;
 
 		sec->dirty &= ~1;
@@ -318,7 +318,8 @@ void SectorGeometry::ValidateSector(unsigned int secnum, int plane)
 			sec->ceilingxpan_ == compare->ceilingxpan_ &&
 			sec->ceilingypan_ == compare->ceilingypan_ &&
 			sec->ceilingz == compare->ceilingz &&
-			wall[wall[sec->wallptr].point2].pos == data[secnum].poscompare &&
+			wall[sec->wallptr].pos == data[secnum].poscompare &&
+			wall[wall[sec->wallptr].point2].pos == data[secnum].poscompare2 &&
 			!(sec->dirty & 2) && data[secnum].planes[plane].vertices.Size()) return;
 
 		sec->dirty &= ~2;