diff --git a/src/slic3r/GUI/ButtonsDescription.hpp b/src/slic3r/GUI/ButtonsDescription.hpp
index 921ce796e..fbed36c2a 100644
--- a/src/slic3r/GUI/ButtonsDescription.hpp
+++ b/src/slic3r/GUI/ButtonsDescription.hpp
@@ -5,6 +5,7 @@
 #include <vector>
 
 class ScalableBitmap;
+class wxColourPickerCtrl;
 
 namespace Slic3r {
 namespace GUI {