diff --git a/libraries/render/src/render/ShapePipeline.h b/libraries/render/src/render/ShapePipeline.h
index 3951e41e44..13daac2db7 100644
--- a/libraries/render/src/render/ShapePipeline.h
+++ b/libraries/render/src/render/ShapePipeline.h
@@ -20,6 +20,7 @@
 
 namespace render {
 class Item;
+class ShapePlumber;
 
 class ShapeKey {
 public: