diff --git a/src/slic3r/GUI/Gizmos/GLGizmoPainterBase.hpp b/src/slic3r/GUI/Gizmos/GLGizmoPainterBase.hpp
index 02b4dd1c7..8a9e87124 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoPainterBase.hpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoPainterBase.hpp
@@ -21,7 +21,7 @@ namespace GUI {
 
 enum class SLAGizmoEventType : unsigned char;
 class ClippingPlane;
-class Camera;
+struct Camera;
 
 enum class PainterGizmoType {
     FDM_SUPPORTS,