1 files changed, 1 insertions, 1 deletions
diff --git a/src/box3d-side.h b/src/box3d-side.h
index 106f3770c..fcd7eb08c 100644
--- a/src/box3d-side.h
+++ b/src/box3d-side.h
@@ -21,7 +21,7 @@
 #define SP_IS_BOX3D_SIDE(obj) (dynamic_cast<const Box3DSide*>((SPObject*)obj))
 
 class SPBox3D;
-struct Persp3D;
+class Persp3D;
 
 // FIXME: Would it be better to inherit from SPPath instead?
 class Box3DSide : public SPPolygon {