diff --git a/BCMeshTransformView/BCMeshTransform.mm b/BCMeshTransformView/BCMeshTransform.mm
index 710ad5c..39893c4 100644
--- a/BCMeshTransformView/BCMeshTransform.mm
+++ b/BCMeshTransformView/BCMeshTransform.mm
@@ -132,6 +132,8 @@ - (BCMeshVertex)vertexAtIndex:(NSUInteger)vertexIndex
 
 @implementation BCMutableMeshTransform
 
+@dynamic depthNormalization;
+
 + (instancetype)meshTransform
 {
     return [[self alloc] init];