diff --git a/GUI/View/Sample/SampleEditorController.h b/GUI/View/Sample/SampleEditorController.h
index 9cd2574d89720b1c284e258019ffa72d01e9fe0e..e2f47e229b08b149667029124d2ec7e29dc2b627 100644
--- a/GUI/View/Sample/SampleEditorController.h
+++ b/GUI/View/Sample/SampleEditorController.h
@@ -34,7 +34,6 @@ class LayerItem;
 class MaterialsSet;
 class MesocrystalForm;
 class ParticleLayoutItem;
-class PolyForm;
 class SampleForm;
 class SampleItem;