diff --git a/lib/bsp_loader/src/brush.rs b/lib/bsp_loader/src/brush.rs
index ac7e85d..8d9e65b 100644
--- a/lib/bsp_loader/src/brush.rs
+++ b/lib/bsp_loader/src/brush.rs
@@ -142,7 +142,7 @@ fn planes_to_faces(face_list:std::collections::HashSet<Face>)->Result<Faces,Plan
 			face.push(intersection.divide().fix_1());
 
 			// the measure
-			let edge_dir=face0.normal.cross(face1.normal);
+			let edge_dir=face0.normal.cross(face2.normal);
 
 			// the dot product to beat
 			let d_intersection=edge_dir.dot(intersection.num)/intersection.den;