diff --git a/src/slic3r/GUI/MeshUtils.hpp b/src/slic3r/GUI/MeshUtils.hpp
index 21c375e81..a2be2677b 100644
--- a/src/slic3r/GUI/MeshUtils.hpp
+++ b/src/slic3r/GUI/MeshUtils.hpp
@@ -14,7 +14,7 @@ class TriangleMeshSlicer;
 
 namespace GUI {
 
-class Camera;
+struct Camera;