diff --git a/src/render/Renderer.hpp b/src/render/Renderer.hpp
index 1c6628f1e..011b17b94 100644
--- a/src/render/Renderer.hpp
+++ b/src/render/Renderer.hpp
@@ -11,6 +11,7 @@
 struct SMonitorRule;
 class CWorkspace;
 class CWindow;
+class CInputPopup;
 
 // TODO: add fuller damage tracking for updating only parts of a window
 enum DAMAGETRACKINGMODES {