1 files changed, 4 insertions, 0 deletions
diff --git a/include/cru/ui/Base.hpp b/include/cru/ui/Base.hpp
index c59d1b60..9036a47b 100644
--- a/include/cru/ui/Base.hpp
+++ b/include/cru/ui/Base.hpp
@@ -185,6 +185,10 @@ class Control;
 class ClickDetector;
 class UiHost;
 
+namespace render {
+class RenderObject;
+}
+
 //-------------------- region: basic types --------------------
 namespace internal {
 constexpr int align_start = 0;