diff --git a/source/blender/editors/include/UI_tree_view.hh b/source/blender/editors/include/UI_tree_view.hh
index dd1a0af2dc0..fac880a0a67 100644
--- a/source/blender/editors/include/UI_tree_view.hh
+++ b/source/blender/editors/include/UI_tree_view.hh
@@ -20,6 +20,7 @@
 
 #pragma once
 
+#include <functional>
 #include <memory>
 #include <string>